Isaac Mattson or Robert Stephenson

Baseball Stats Comparison

Stats
Projections
News & Notes
Schedule

Isaac Mattson or Robert Stephenson Player Statistics
	Robert Stephenson RP - LAA	Isaac Mattson RP - PIT
2026 Stats


Games Played	‐	38

Games Started	‐	0

Innings Pitched	‐	38.2

Wins	‐	0

Losses	‐	0

Saves	‐	0

Blown Saves	‐	2

Holds	‐	8

Hits Allowed	‐	44

Earned Runs	‐	23

Home Runs Allowed	‐	3

Strikeouts	‐	36

Walks	‐	18

ERA	‐	5.35

WHIP	‐	1.60

Isaac Mattson or Robert Stephenson Player Projections
	Robert Stephenson RP - LAA	Isaac Mattson RP - PIT
2026 Projections


Games Played	33	57

Games Started	0	0

Innings Pitched	33.5	60.8

Wins	2	3

Losses	2	3

Saves	3	2

Blown Saves	1	1

Holds	4	14

Hits Allowed	29	55

Earned Runs	17	30

Home Runs Allowed	5	7

Strikeouts	39	59

Walks	11	28

ERA	4.69	4.44

WHIP	1.19	1.35

Isaac Mattson or Robert Stephenson Player Notes
	Robert Stephenson RP - LAA	Isaac Mattson RP - PIT
News
	Stephenson signed a three-year, $33 million deal with the Angels after the 2023 season and previously underwent UCL reconstruction in May 2024. He experienced thoracic outlet syndrome symptoms over the winter and was eased into spring workouts before right elbow inflammation emerged and landed him on the 60-day IL prior to Opening Day. Bruno Mulé Wed, Apr 8th	The Pirates placed RHP Isaac Mattson on the 15-day injured list with hip inflammation. Ari Koslow Tue, Sep 8th
	The Angels placed RHP Robert Stephenson on the 60-day injured list with right elbow inflammation. Ari Koslow Wed, Mar 25th	The Pirates recalled RHP Isaac Mattson from Triple-A Indianapolis. Ari Koslow Fri, Sep 4th
	Angels reliever Robert Stephenson has suffered a setback and said there is concern of further damage to his UCL. Brenton Kemp Sat, Mar 14th	The Pirates optioned Isaac Mattson to Triple-A Indianapolis. Ari Koslow Tue, Aug 18th
	Angels reliever Robert Stephenson (shoulder) has suffered a setback and wil undergo tests. Brenton Kemp Sat, Mar 14th	The Pirates recalled RHP Isaac Mattson from Triple-A Indianapolis. Ari Koslow Thu, Aug 13th
	Robert Stephenson said he “felt great” after facing live hitters for the first time on Friday. Ari Koslow Fri, Mar 6th	The Pirates optioned RHP Isaac Mattson to Triple-A Indianapolis. Ari Koslow Sun, Aug 2nd
Notes
There are no recent notes for these players

Isaac Mattson or Robert Stephenson Player Schedules
Date	Opp	Opp Pitcher	VBR	Opp	Opp Pitcher	VBR
	Robert Stephenson RP - LAA			Isaac Mattson RP - PIT
Thu, Mar 26th	@ HOU	Hunter Brown (6-3)	#23	@ NYM	Freddy Peralta (9-11)	#44
Sat, Mar 28th	@ HOU	Cristian Javier (2-5)	#102	@ NYM	David Peterson (8-8)	#93
Sun, Mar 29th	@ HOU	Tatsuya Imai (6-4)	#186	@ NYM	Nolan McLean (11-9)	#30
Mon, Mar 30th	@ CHC	Edward Cabrera (5-5)	#169	@ CIN	Chase Burns (15-3)	#34
Tue, Mar 31st	@ CHC	Jameson Taillon (2-6)		@ CIN	Brandon Williamson (4-4)	#387
Wed, Apr 1st	@ CHC	Matthew Boyd (8-5)	#62	@ CIN	Andrew Abbott (6-11)	#132
Fri, Apr 3rd	vs SEA	Bryan Woo (12-9)	#16	vs BAL	Kyle Bradish (7-14)
Sat, Apr 4th	vs SEA	Emerson Hancock (7-8)	#208	vs BAL	Shane Baz (6-15)	#86
Sun, Apr 5th	vs SEA	Luis Castillo (4-11)	#114	vs BAL	Chris Bassitt (7-5)	#126
Mon, Apr 6th	vs ATL	Chris Sale (14-9)	#5	vs SD	German Marquez (4-2)	#270
Tue, Apr 7th	vs ATL	Reynaldo Lopez (4-5)	#69	vs SD	Nick Pivetta (2-2)	#28
Wed, Apr 8th	vs ATL	Grant Holmes (9-5)	#130	vs SD	Michael King (11-9)	#55
Fri, Apr 10th	@ CIN	Chase Burns (15-3)	#34	@ CHC	Shota Imanaga (10-10)	#29
Sat, Apr 11th	@ CIN	Brandon Williamson (4-4)	#387	@ CHC	Edward Cabrera (5-5)	#169
Sun, Apr 12th	@ CIN	Andrew Abbott (6-11)	#132	@ CHC	Jameson Taillon (2-6)
Mon, Apr 13th	@ NYY	Will Warren (10-6)	#61	vs WSH	Cade Cavalli (12-5)	#54
Tue, Apr 14th	@ NYY	Ryan Weathers (5-8)	#144	vs WSH	PJ Poulin (3-0)
Wed, Apr 15th	@ NYY	Luis Gil (1-2)	#298	vs WSH	Jake Irvin (2-9)	#140
Thu, Apr 16th	@ NYY	Max Fried (5-4)	#15	vs WSH	Foster Griffin (15-5)	#52
Fri, Apr 17th	vs SD	Matt Waldron (2-2)		vs TB	Nick Martinez (14-4)	#80
Sat, Apr 18th	vs SD	German Marquez (4-2)	#270	vs TB	Drew Rasmussen (14-5)	#14
Sun, Apr 19th	vs SD	Michael King (11-9)	#55	vs TB	Shane McClanahan (10-7)	#172
Tue, Apr 21st	vs TOR	Patrick Corbin (3-4)		@ TEX	Kumar Rocker (5-11)	#119
Wed, Apr 22nd	vs TOR	Eric Lauer (8-7)		@ TEX	Jack Leiter (3-7)	#212
Thu, Apr 23rd				@ TEX	Jacob deGrom (11-9)	#10
Fri, Apr 24th	@ KC	Noah Cameron (9-8)	#72	@ MIL	Brandon Woodruff (2-2)
Sat, Apr 25th	@ KC	Cole Ragans (1-4)		@ MIL	Jacob Misiorowski (15-5)	#8
Sun, Apr 26th	@ KC	Seth Lugo (7-8)	#118	@ MIL	Kyle Harrison (10-4)	#108
Mon, Apr 27th	@ CWS	Anthony Kay (9-9)	#129	vs STL	Dustin May (7-9)	#53
Tue, Apr 28th	@ CWS	Davis Martin (9-7)	#91	vs STL	Kyle Leahy (10-4)	#73
Wed, Apr 29th	@ CWS	Erick Fedde (8-9)	#366	vs STL	Andre Pallante (12-7)	#100
Thu, Apr 30th				vs STL	Hunter Dobbins (3-3)
Fri, May 1st	vs NYM	Christian Scott (4-5)	#39	vs CIN	Brady Singer (6-14)	#163
Sat, May 2nd	vs NYM	Nolan McLean (11-9)	#30	vs CIN	Rhett Lowder (6-11)	#151
Sun, May 3rd	vs NYM	Clay Holmes (6-7)	#64	vs CIN	Chase Burns (15-3)	#34
Tue, May 5th	vs CWS	Erick Fedde (8-9)	#366	@ ARI	Eduardo Rodriguez (15-6)	#105
Wed, May 6th	vs CWS	Noah Schultz (3-9)	#242	@ ARI	Michael Soroka (8-5)	#58
Thu, May 7th				@ ARI	Zac Gallen (3-9)	#221
Fri, May 8th	@ TOR	Dylan Cease (11-5)	#4	@ SF	Robbie Ray (12-8)	#106
Sat, May 9th	@ TOR	Trey Yesavage (5-5)	#157	@ SF	Landen Roupp (9-14)	#99
Sun, May 10th	@ TOR	Spencer Miles (6-2)	#133	@ SF	Tyler Mahle (6-10)	#63
Tue, May 12th	@ CLE	Slade Cecconi (4-7)	#148	vs COL	Michael Lorenzen (3-13)	#194
Wed, May 13th	@ CLE	Parker Messick (11-9)	#31	vs COL	Jose Quintana (2-3)	#395
Thu, May 14th				vs COL	Chase Dollander (3-3)
Fri, May 15th	vs LAD	Will Klein (3-4)		vs PHI	Aaron Nola (6-10)	#51
Sat, May 16th	vs LAD	Justin Wrobleski (11-5)	#182	vs PHI	Cristopher Sanchez (17-6)	#3
Sun, May 17th	vs LAD	Roki Sasaki (5-5)	#76	vs PHI	Zack Wheeler (12-5)	#7
Tue, May 19th	vs ATH	Jacob Lopez (6-4)	#135	@ STL	Matthew Liberatore (5-14)	#85
Wed, May 20th	vs ATH	Aaron Civale (6-7)	#159	@ STL	Michael McGreevy (7-9)	#87
Thu, May 21st	vs ATH	Luis Severino (2-6)		@ STL	Dustin May (7-9)	#53
Fri, May 22nd	vs TEX	Jacob deGrom (11-9)	#10	@ TOR	Kevin Gausman (9-12)	#32
Sat, May 23rd	vs TEX	Nathan Eovaldi (10-9)	#122	@ TOR	Patrick Corbin (3-4)
Sun, May 24th	vs TEX	MacKenzie Gore (8-11)	#48	@ TOR	Dylan Cease (11-5)	#4
Mon, May 25th				vs CHC	Ben Brown (4-2)
Tue, May 26th	@ DET	Keider Montero (9-8)	#127	vs CHC	Jordan Wicks (0-2)	#262
Wed, May 27th	@ DET	Casey Mize (6-9)	#45	vs CHC	Jameson Taillon (2-6)
Thu, May 28th	@ DET	Jack Flaherty (3-8)	#66	vs CHC	Colin Rea (8-8)	#224
Fri, May 29th	@ TB	Nick Martinez (14-4)	#80	vs MIN	Taj Bradley (11-6)	#40
Sat, May 30th	@ TB	Drew Rasmussen (14-5)	#14	vs MIN	Bailey Ober (7-6)	#81
Sun, May 31st	@ TB	Shane McClanahan (10-7)	#172	vs MIN	Zebby Matthews (9-10)	#89
Tue, Jun 2nd	vs COL	Tomoyuki Sugano (12-10)	#394	@ HOU	Mike Burrows (4-9)	#259
Wed, Jun 3rd	vs COL	Michael Lorenzen (3-13)	#194	@ HOU	Spencer Arrighetti (8-9)	#145
Thu, Jun 4th				@ HOU	Kai-Wei Teng (5-7)	#363
Fri, Jun 5th	@ LAD	Roki Sasaki (5-5)	#76	@ ATL	Martin Perez (9-9)	#137
Sat, Jun 6th	@ LAD	Yoshinobu Yamamoto (14-8)	#2	@ ATL	Spencer Strider (4-2)
Sun, Jun 7th	@ LAD	Emmet Sheehan (5-8)	#112	@ ATL	Bryce Elder (8-8)
Tue, Jun 9th	vs HOU	Kai-Wei Teng (5-7)	#363	vs LAD	Eric Lauer (8-7)
Wed, Jun 10th	vs HOU	Peter Lambert (8-9)	#181	vs LAD	Shohei Ohtani (8-2)	#21
Thu, Jun 11th				vs LAD	Justin Wrobleski (11-5)	#182
Fri, Jun 12th	vs TB	Shane McClanahan (10-7)	#172	vs MIA	Sandy Alcantara (13-10)	#97
Sat, Jun 13th	vs TB	Griffin Jax (7-10)	#35	vs MIA	Lake Bachar (1-4)	#281
Sun, Jun 14th	vs TB	Casey Legumina (2-2)	#187	vs MIA	Max Meyer (9-1)
Mon, Jun 15th	@ ARI	Ryne Nelson (3-5)	#179	@ ATH	J.T. Ginn (9-8)
Tue, Jun 16th	@ ARI	Merrill Kelly (9-13)	#136	@ ATH	Jack Perkins (3-11)	#109
Wed, Jun 17th	@ ARI	Eduardo Rodriguez (15-6)	#105	@ ATH	Aaron Civale (6-7)	#159
Fri, Jun 19th	@ ATH	Jeffrey Springs (4-13)	#164	@ COL	Kyle Freeland (4-10)	#393
Sat, Jun 20th	@ ATH	J.T. Ginn (9-8)		@ COL	Tomoyuki Sugano (12-10)	#394
Sun, Jun 21st	@ ATH	Jack Perkins (3-11)	#109	@ COL	Michael Lorenzen (3-13)	#194
Tue, Jun 23rd	vs BAL	Shane Baz (6-15)	#86	vs SEA	George Kirby (9-11)	#22
Wed, Jun 24th	vs BAL	Trey Gibson (1-3)	#300	vs SEA	Bryan Woo (12-9)	#16
Thu, Jun 25th				vs SEA	Bryce Miller (4-9)	#46
Fri, Jun 26th	vs ATH	J.T. Ginn (9-8)		vs CIN	Andrew Abbott (6-11)	#132
Sat, Jun 27th	vs ATH	Jack Perkins (3-11)	#109	vs CIN	Chase Burns (15-3)	#34
Sun, Jun 28th	vs ATH	Aaron Civale (6-7)	#159	vs CIN	Brady Singer (6-14)	#163
Mon, Jun 29th	@ SEA	George Kirby (9-11)	#22	@ PHI	Aaron Nola (6-10)	#51
Tue, Jun 30th	@ SEA	Bryan Woo (12-9)	#16	@ PHI	Cristopher Sanchez (17-6)	#3
Wed, Jul 1st				@ PHI	Zack Wheeler (12-5)	#7
Thu, Jul 2nd	@ SEA	Bryce Miller (4-9)	#46	@ PHI	Alan Rangel (0-3)	#374
Fri, Jul 3rd	vs BOS	Jake Bennett (9-7)	#67	@ WSH	Foster Griffin (15-5)	#52
Sat, Jul 4th	vs BOS	Sonny Gray (17-5)	#33	@ WSH	Carson Palmquist (0-2)	#354
Sun, Jul 5th	vs BOS	Ranger Suarez (7-4)	#41	@ WSH	Cade Cavalli (12-5)	#54
Tue, Jul 7th	@ TEX	Jacob deGrom (11-9)	#10	vs ATL	Hurston Waldrep (0-1)
Wed, Jul 8th	@ TEX	MacKenzie Gore (8-11)	#48	vs ATL	Grant Holmes (9-5)	#130
Thu, Jul 9th	@ TEX	Nathan Eovaldi (10-9)	#122	vs ATL	Bryce Elder (8-8)
Sat, Jul 11th	@ MIN	Joe Ryan (6-10)	#25	vs MIL	Shane Drohan (7-5)	#82
Sun, Jul 12th	@ MIN	Taj Bradley (11-6)	#40	vs MIL	Robert Gasser (4-5)	#83
Sat, Jul 18th	vs DET	Tarik Skubal (10-7)	#1	@ CLE	Logan Allen (0-0)	#238
Sun, Jul 19th	vs DET	Casey Mize (6-9)	#45	@ CLE	Joey Cantillo (9-9)	#65
Mon, Jul 20th	vs STL	Kyle Leahy (10-4)	#73	@ NYY	Ryan Weathers (5-8)	#144
Wed, Jul 22nd	vs STL	Hunter Dobbins (3-3)		@ NYY	Max Fried (5-4)	#15
Fri, Jul 24th	@ SF	Logan Webb (8-9)	#26	vs CHC	Matthew Boyd (8-5)	#62
Sat, Jul 25th	@ SF	Robbie Ray (12-8)	#106	vs CHC	Shota Imanaga (10-10)	#29
Sun, Jul 26th	@ SF	Carson Whisenhunt (3-4)		vs CHC	Jameson Taillon (2-6)
Mon, Jul 27th	vs HOU	Tatsuya Imai (6-4)	#186	vs ARI	Merrill Kelly (9-13)	#136
Tue, Jul 28th	vs HOU	Peter Lambert (8-9)	#181	vs ARI	Brandon Pfaadt (7-3)	#92
Wed, Jul 29th	vs HOU	Hayden Wesneski (5-2)	#78	vs ARI	Eduardo Rodriguez (15-6)	#105
Thu, Jul 30th				@ CIN	Rhett Lowder (6-11)	#151
Fri, Jul 31st	vs MIL	Shane Drohan (7-5)	#82	@ CIN	Hunter Greene (2-2)
Sat, Aug 1st	vs MIL	Robert Gasser (4-5)	#83	@ CIN	Andrew Abbott (6-11)	#132
Sun, Aug 2nd	vs MIL	Jacob Misiorowski (15-5)	#8	@ CIN	Chase Burns (15-3)	#34
Mon, Aug 3rd				@ MIL	Brandon Sproat (3-7)	#170
Tue, Aug 4th	@ BAL	Cade Povich (2-1)	#171	@ MIL	Logan Henderson (10-3)	#27
Wed, Aug 5th	@ BAL	Trevor Rogers (10-10)	#56	@ MIL	Kyle Harrison (10-4)	#108
Thu, Aug 6th	@ BAL	Brandon Young (9-4)	#117	@ MIL	Dustin May (7-9)	#53
Fri, Aug 7th	@ MIA	Tyler Phillips (5-6)	#335	vs NYM	Zac Thornton (4-5)	#98
Sat, Aug 8th	@ MIA	Sandy Alcantara (13-10)	#97	vs NYM	Robert Stock (1-3)	#235
Sun, Aug 9th	@ MIA	Ryan Gusto (1-5)	#255	vs NYM	Sean Manaea (5-7)	#60
Tue, Aug 11th	vs TEX	Cody Bradford (0-5)	#103	@ MIA	Eury Perez (7-11)	#49
Wed, Aug 12th	vs TEX	Cal Quantrill (9-5)	#142	@ MIA	Janson Junk (6-9)	#110
Thu, Aug 13th	vs TEX	Jacob deGrom (11-9)	#10	@ MIA	Tyler Phillips (5-6)	#335
Fri, Aug 14th	vs KC	Seth Lugo (7-8)	#118	vs BOS	Jake Bennett (9-7)	#67
Sat, Aug 15th	vs KC	Randy Dobnak (3-4)	#309	vs BOS	Sonny Gray (17-5)	#33
Sun, Aug 16th	vs KC	Noah Cameron (9-8)	#72	vs BOS	Patrick Sandoval (1-6)	#104
Mon, Aug 17th				vs DET	Framber Valdez (10-10)	#36
Tue, Aug 18th	@ HOU	Cristian Javier (2-5)	#102	vs DET	Keider Montero (9-8)	#127
Wed, Aug 19th	@ HOU	Ethan Pecko (1-0)	#218	vs DET	Jackson Jobe (2-2)	#228
Fri, Aug 21st	@ TEX	MacKenzie Gore (8-11)	#48	@ LAD	Yoshinobu Yamamoto (14-8)	#2
Sat, Aug 22nd	@ TEX	Cody Bradford (0-5)	#103	@ LAD	Tarik Skubal (10-7)	#1
Sun, Aug 23rd	@ TEX	Cal Quantrill (9-5)	#142	@ LAD	Blake Snell (4-1)	#9
Mon, Aug 24th	vs CLE	Parker Messick (11-9)	#31	@ SD	Robbie Ray (12-8)	#106
Tue, Aug 25th	vs CLE	Gavin Williams (13-8)	#18	@ SD	Michael King (11-9)	#55
Wed, Aug 26th	vs CLE	Joey Cantillo (9-9)	#65	@ SD	Randy Vasquez (10-6)	#327
Fri, Aug 28th	vs PHI	Andrew Painter (3-9)	#113	@ STL	Quinn Mathews (2-3)	#202
Sat, Aug 29th	vs PHI	Cristopher Sanchez (17-6)	#3	@ STL	Kyle Leahy (10-4)	#73
Sun, Aug 30th	vs PHI	Zack Wheeler (12-5)	#7	@ STL	Matthew Liberatore (5-14)	#85
Tue, Sep 1st	vs NYY	Gerrit Cole (8-9)	#19	vs SF	Logan Webb (8-9)	#26
Wed, Sep 2nd	vs NYY	Cam Schlittler (14-6)	#13	vs SF	Landen Roupp (9-14)	#99
Thu, Sep 3rd				vs SF	Blade Tidwell (1-2)	#303
Fri, Sep 4th	@ PIT	Jared Jones (4-6)	#42	vs LAA	Ryan Johnson (5-8)	#150
Sat, Sep 5th	@ PIT	Braxton Ashcraft (14-6)		vs LAA	Yusei Kikuchi (1-5)	#68
Sun, Sep 6th	@ PIT	Paul Skenes (10-11)	#11	vs LAA	Walbert Urena (9-10)	#147
Tue, Sep 8th	@ BOS	Patrick Sandoval (1-6)	#104	@ CWS	Sean Burke (9-7)	#74
Wed, Sep 9th	@ BOS	Jake Bennett (9-7)	#67	@ CWS	Davis Martin (9-7)	#91
Thu, Sep 10th				@ CWS	Hagen Smith (3-1)	#184
Fri, Sep 11th	@ WSH	Cade Cavalli (12-5)	#54	@ CHC	Shota Imanaga (10-10)	#29
Sat, Sep 12th	@ WSH	Andrew Alvarez (2-6)	#168	@ CHC	Clay Holmes (6-7)	#64
Sun, Sep 13th	@ WSH	Riley Cornelio (2-2)	#292	@ CHC	Matthew Boyd (8-5)	#62
Tue, Sep 15th	vs SEA	Logan Gilbert (12-10)	#6	vs MIL	Jacob Misiorowski (15-5)	#8
Wed, Sep 16th	vs SEA	George Kirby (9-11)	#22	vs MIL	Logan Henderson (10-3)	#27
Thu, Sep 17th	vs MIN	Taj Bradley (11-6)	#40	vs MIL	Dustin May (7-9)	#53
Fri, Sep 18th	vs MIN	Connor Prielipp (5-7)	#115	vs KC	Randy Dobnak (3-4)	#309
Sat, Sep 19th	vs MIN	Joe Ryan (6-10)	#25	vs KC	Noah Cameron (9-8)	#72
Sun, Sep 20th	vs MIN	Dean Kremer (3-5)	#59	vs KC	Michael Wacha (9-9)	#71
Tue, Sep 22nd	@ ATH	Brady Basso (1-2)	#227	vs STL	Andre Pallante (12-7)	#100
Wed, Sep 23rd	@ ATH	Jeffrey Springs (4-13)	#164	vs STL	Matthew Liberatore (5-14)	#85
Thu, Sep 24th	@ SEA	Bryan Woo (12-9)	#16	vs STL	Kyle Leahy (10-4)	#73
Fri, Sep 25th	@ SEA	Emerson Hancock (7-8)	#208	@ DET	Jackson Jobe (2-2)	#228
Sat, Sep 26th	@ SEA			@ DET
Sun, Sep 27th	@ SEA			@ DET
Fri, Mar 27th	@ HOU	Mike Burrows (4-9)	#259
Mon, Apr 20th	vs TOR	Dylan Cease (11-5)	#4
Mon, May 4th	vs CWS	Davis Martin (9-7)	#91
Mon, May 11th	@ CLE	Joey Cantillo (9-9)	#65
Mon, May 18th	vs ATH	J.T. Ginn (9-8)
Mon, Jun 1st	vs COL	Kyle Freeland (4-10)	#393
Mon, Jun 8th	vs HOU	Spencer Arrighetti (8-9)	#145
Thu, Jun 18th	@ ATH	Gage Jump (6-11)	#96
Mon, Jun 22nd	vs BAL	Kyle Bradish (7-14)
Fri, Jul 10th	@ MIN	Zebby Matthews (9-10)	#89
Fri, Jul 17th	vs DET	Troy Melton (8-4)	#57
Tue, Jul 21st	vs STL	Matthew Liberatore (5-14)	#85
Mon, Aug 10th	vs TEX	MacKenzie Gore (8-11)	#48
Thu, Aug 20th	@ HOU	Peter Lambert (8-9)	#181
Mon, Aug 31st	vs NYY	Elmer Rodriguez (0-3)	#206
Mon, Sep 7th	@ BOS	Brayan Bello (6-7)	#111
Mon, Sep 14th	vs SEA	Kade Anderson (1-2)	#84