Isaac Mattson or John Klein

Baseball Stats Comparison

Stats
Projections
News & Notes
Schedule

Isaac Mattson or John Klein Player Statistics
	Isaac Mattson RP - PIT	John Klein SP,RP - TOR
2026 Stats


Games Played	37	3

Games Started	0	0

Innings Pitched	36.2	4.1

Wins	0	0

Losses	0	1

Saves	0	0

Blown Saves	2	0

Holds	8	0

Hits Allowed	40	3

Earned Runs	20	2

Home Runs Allowed	3	1

Strikeouts	34	2

Walks	18	4

ERA	4.91	4.15

WHIP	1.58	1.62

Isaac Mattson or John Klein Player Projections
	Isaac Mattson RP - PIT	John Klein SP,RP - TOR
2026 Projections


Games Played	57	28

Games Started	0	1

Innings Pitched	60.8	35.4

Wins	3	2

Losses	3	2

Saves	2	0

Blown Saves	1	0

Holds	14	1

Hits Allowed	55	35

Earned Runs	30	18

Home Runs Allowed	7	5

Strikeouts	59	30

Walks	28	13

ERA	4.44	4.57

WHIP	1.35	1.36

Isaac Mattson or John Klein Player Notes
	Isaac Mattson RP - PIT	John Klein SP,RP - TOR
News
	The Pirates optioned Isaac Mattson to Triple-A Indianapolis. Ari Koslow Tue, Aug 18th	The Twins optioned John Klein to Triple-A St. Paul. Ari Koslow Sun, May 31st
	The Pirates recalled RHP Isaac Mattson from Triple-A Indianapolis. Ari Koslow Thu, Aug 13th	The Twins recalled RHP John Klein from Triple-A St. Paul. Ari Koslow Sat, May 30th
	The Pirates optioned RHP Isaac Mattson to Triple-A Indianapolis. Ari Koslow Sun, Aug 2nd	The Twins optioned RHP John Klein to Triple-A St. Paul. Ari Koslow Thu, May 7th
	The Pirates recalled RHP Isaac Mattson from Triple-A Indianapolis. Ari Koslow Sat, Aug 1st	John Klein has been recalled from Triple-A St. Paul. Vince DiSilvio Sat, May 2nd
	The Pirates optioned RHP Isaac Mattson to Triple-A Indianapolis. Ari Koslow Wed, Jul 29th	The Twins have optioned right-hander John Klein to Triple-A St. Paul. Brenton Kemp Tue, Mar 10th
Notes
There are no recent notes for these players

Isaac Mattson or John Klein Player Schedules
Date	Opp	Opp Pitcher	VBR	Opp	Opp Pitcher	VBR
	Isaac Mattson RP - PIT			John Klein SP,RP - TOR
Thu, Mar 26th	@ NYM	Freddy Peralta (6-11)	#38
Sat, Mar 28th	@ NYM	David Peterson (7-7)	#75	vs ATH	Jeffrey Springs (3-12)	#251
Sun, Mar 29th	@ NYM	Nolan McLean (10-8)	#33	vs ATH	Luis Morales (0-2)	#422
Mon, Mar 30th	@ CIN	Chase Burns (14-3)	#22	vs COL	Tomoyuki Sugano (12-8)	#436
Tue, Mar 31st	@ CIN	Brandon Williamson (2-3)	#277	vs COL	Ryan Feltner (5-8)	#435
Wed, Apr 1st	@ CIN	Andrew Abbott (6-10)	#90	vs COL	Kyle Freeland (4-10)	#419
Fri, Apr 3rd	vs BAL	Kyle Bradish (7-12)	#53	@ CWS	Grant Taylor (7-2)	#34
Sat, Apr 4th	vs BAL	Shane Baz (5-14)	#64	@ CWS	Grant Taylor (7-2)	#34
Sun, Apr 5th	vs BAL	Chris Bassitt (5-4)	#110	@ CWS	Davis Martin (9-6)	#121
Mon, Apr 6th	vs SD	German Marquez (4-2)	#423	vs LAD	Justin Wrobleski (11-5)	#134
Tue, Apr 7th	vs SD	Nick Pivetta (1-2)	#192	vs LAD	Yoshinobu Yamamoto (12-8)	#8
Wed, Apr 8th	vs SD	Michael King (8-9)	#55	vs LAD	Shohei Ohtani (8-2)	#1
Fri, Apr 10th	@ CHC	Shota Imanaga (8-9)	#29	vs MIN	Simeon Woods Richardson (2-7)	#358
Sat, Apr 11th	@ CHC	Edward Cabrera (5-5)	#133	vs MIN	Joe Ryan (6-8)	#70
Sun, Apr 12th	@ CHC	Jameson Taillon (2-6)	#179	vs MIN	Taj Bradley (9-6)	#40
Mon, Apr 13th	vs WSH	Cade Cavalli (12-5)	#61
Tue, Apr 14th	vs WSH	PJ Poulin (3-0)		@ MIL	Jacob Misiorowski (14-5)	#6
Wed, Apr 15th	vs WSH	Jake Irvin (2-8)	#195	@ MIL	Chad Patrick (7-4)	#128
Thu, Apr 16th	vs WSH	Foster Griffin (15-4)	#37	@ MIL	Brandon Sproat (3-7)	#163
Fri, Apr 17th	vs TB	Nick Martinez (13-4)	#71	@ ARI	Michael Soroka (8-4)	#111
Sat, Apr 18th	vs TB	Drew Rasmussen (14-5)	#15	@ ARI	Zac Gallen (3-9)	#177
Sun, Apr 19th	vs TB	Shane McClanahan (10-6)	#52	@ ARI	Ryne Nelson (3-5)	#132
Tue, Apr 21st	@ TEX	Kumar Rocker (5-10)	#120	@ LAA	Jack Kochanowicz (2-5)
Wed, Apr 22nd	@ TEX	Jack Leiter (3-7)	#229	@ LAA	Jose Soriano (11-7)	#36
Thu, Apr 23rd	@ TEX	Jacob deGrom (9-9)	#7
Fri, Apr 24th	@ MIL	Brandon Woodruff (2-2)		vs CLE	Gavin Williams (12-7)	#20
Sat, Apr 25th	@ MIL	Jacob Misiorowski (14-5)	#6	vs CLE	Joey Cantillo (9-7)	#79
Sun, Apr 26th	@ MIL	Kyle Harrison (10-3)	#54	vs CLE	Slade Cecconi (4-7)	#130
Mon, Apr 27th	vs STL	Dustin May (6-8)	#44	vs BOS	Ranger Suarez (5-3)	#30
Tue, Apr 28th	vs STL	Kyle Leahy (10-4)	#96	vs BOS	Payton Tolle (8-6)	#27
Wed, Apr 29th	vs STL	Andre Pallante (12-6)	#274	vs BOS	Brayan Bello (5-7)	#146
Thu, Apr 30th	vs STL	Hunter Dobbins (3-3)	#188	@ MIN	Bailey Ober (7-4)	#108
Fri, May 1st	vs CIN	Brady Singer (5-12)	#223	@ MIN	Simeon Woods Richardson (2-7)	#358
Sat, May 2nd	vs CIN	Rhett Lowder (6-8)	#219	@ MIN	Connor Prielipp (3-7)	#81
Sun, May 3rd	vs CIN	Chase Burns (14-3)	#22	@ MIN	Joe Ryan (6-8)	#70
Tue, May 5th	@ ARI	Eduardo Rodriguez (14-4)	#82	@ TB	Drew Rasmussen (14-5)	#15
Wed, May 6th	@ ARI	Michael Soroka (8-4)	#111	@ TB	Shane McClanahan (10-6)	#52
Thu, May 7th	@ ARI	Zac Gallen (3-9)	#177
Fri, May 8th	@ SF	Robbie Ray (11-7)	#83	vs LAA	Reid Detmers (4-8)	#39
Sat, May 9th	@ SF	Landen Roupp (8-13)	#74	vs LAA	Jack Kochanowicz (2-5)
Sun, May 10th	@ SF	Tyler Mahle (5-10)	#68	vs LAA	Jose Soriano (11-7)	#36
Tue, May 12th	vs COL	Michael Lorenzen (3-11)	#199	vs TB	Shane McClanahan (10-6)	#52
Wed, May 13th	vs COL	Jose Quintana (2-3)	#432	vs TB	Griffin Jax (6-9)	#86
Thu, May 14th	vs COL	Chase Dollander (3-3)
Fri, May 15th	vs PHI	Aaron Nola (5-10)	#47	@ DET	Brenan Hanifee
Sat, May 16th	vs PHI	Cristopher Sanchez (16-4)	#3	@ DET	Casey Mize (5-8)	#41
Sun, May 17th	vs PHI	Zack Wheeler (10-5)	#12	@ DET	Jack Flaherty (3-8)	#101
Tue, May 19th	@ STL	Matthew Liberatore (5-12)	#100	@ NYY	Will Warren (8-6)	#57
Wed, May 20th	@ STL	Michael McGreevy (5-9)	#122	@ NYY	Cam Schlittler (12-6)	#14
Thu, May 21st	@ STL	Dustin May (6-8)	#44	@ NYY	Carlos Rodon (4-3)	#42
Fri, May 22nd	@ TOR	Kevin Gausman (8-11)	#23	vs PIT	Bubba Chandler (6-9)	#116
Sat, May 23rd	@ TOR	Patrick Corbin (3-4)		vs PIT	Paul Skenes (9-11)	#5
Sun, May 24th	@ TOR	Dylan Cease (9-5)	#10	vs PIT	Mitch Keller (6-8)
Mon, May 25th	vs CHC	Ben Brown (4-2)	#202	vs MIA	Janson Junk (6-8)	#117
Tue, May 26th	vs CHC	Jordan Wicks (0-2)	#295	vs MIA	Sandy Alcantara (13-8)	#59
Wed, May 27th	vs CHC	Jameson Taillon (2-6)	#179	vs MIA	Eury Perez (7-10)	#50
Thu, May 28th	vs CHC	Colin Rea (8-8)	#169	@ BAL	Chris Bassitt (5-4)	#110
Fri, May 29th	vs MIN	Taj Bradley (9-6)	#40	@ BAL	Trevor Rogers (9-9)	#56
Sat, May 30th	vs MIN	Bailey Ober (7-4)	#108	@ BAL	Brandon Young (9-3)	#167
Sun, May 31st	vs MIN	Zebby Matthews (8-8)	#105	@ BAL	Kyle Bradish (7-12)	#53
Tue, Jun 2nd	@ HOU	Mike Burrows (4-9)	#182	@ ATL	Bryce Elder (8-7)	#187
Wed, Jun 3rd	@ HOU	Spencer Arrighetti (7-7)	#200	@ ATL	Grant Holmes (9-5)	#196
Thu, Jun 4th	@ HOU	Kai-Wei Teng (5-6)	#183	@ ATL	Chris Sale (13-9)	#4
Fri, Jun 5th	@ ATL	Martin Perez (8-8)	#226	vs BAL	Brandon Young (9-3)	#167
Sat, Jun 6th	@ ATL	Spencer Strider (4-2)	#315	vs BAL	Kyle Bradish (7-12)	#53
Sun, Jun 7th	@ ATL	Bryce Elder (8-7)	#187	vs BAL	Shane Baz (5-14)	#64
Tue, Jun 9th	vs LAD	Eric Lauer (8-6)	#227	vs PHI	Zack Wheeler (10-5)	#12
Wed, Jun 10th	vs LAD	Shohei Ohtani (8-2)	#1	vs PHI	Jesus Luzardo (12-5)	#9
Thu, Jun 11th	vs LAD	Justin Wrobleski (11-5)	#134
Fri, Jun 12th	vs MIA	Sandy Alcantara (13-8)	#59	vs NYY	Ryan Weathers (5-8)	#233
Sat, Jun 13th	vs MIA	Lake Bachar (1-3)	#248	vs NYY	Cam Schlittler (12-6)	#14
Sun, Jun 14th	vs MIA	Max Meyer (9-1)		vs NYY	Will Warren (8-6)	#57
Mon, Jun 15th	@ ATH	J.T. Ginn (9-8)	#193
Tue, Jun 16th	@ ATH	Jack Perkins (3-10)	#138	@ BOS	Payton Tolle (8-6)	#27
Wed, Jun 17th	@ ATH	Aaron Civale (6-7)	#210	@ BOS	Jake Bennett (9-6)	#92
Fri, Jun 19th	@ COL	Kyle Freeland (4-10)	#419	@ CHC	Ben Brown (4-2)	#202
Sat, Jun 20th	@ COL	Tomoyuki Sugano (12-8)	#436	@ CHC	Colin Rea (8-8)	#169
Sun, Jun 21st	@ COL	Michael Lorenzen (3-11)	#199
Tue, Jun 23rd	vs SEA	George Kirby (9-10)	#24	vs HOU	Peter Lambert (8-7)	#164
Wed, Jun 24th	vs SEA	Bryan Woo (9-9)	#11	vs HOU	Mike Burrows (4-9)	#182
Thu, Jun 25th	vs SEA	Bryce Miller (4-8)	#73	vs TEX	MacKenzie Gore (7-10)	#35
Fri, Jun 26th	vs CIN	Andrew Abbott (6-10)	#90	vs TEX	Nathan Eovaldi (10-9)	#80
Sat, Jun 27th	vs CIN	Chase Burns (14-3)	#22	vs TEX	Cal Quantrill (6-5)	#197
Sun, Jun 28th	vs CIN	Brady Singer (5-12)	#223	vs TEX	Kumar Rocker (5-10)	#120
Mon, Jun 29th	@ PHI	Aaron Nola (5-10)	#47	vs NYM	Sean Manaea (4-6)	#58
Tue, Jun 30th	@ PHI	Cristopher Sanchez (16-4)	#3	vs NYM	Nolan McLean (10-8)	#33
Wed, Jul 1st	@ PHI	Zack Wheeler (10-5)	#12	vs NYM	Freddy Peralta (6-11)	#38
Thu, Jul 2nd	@ PHI	Alan Rangel (0-3)	#400
Fri, Jul 3rd	@ WSH	Foster Griffin (15-4)	#37	@ SEA	Luis Castillo (4-10)	#97
Sat, Jul 4th	@ WSH	Carson Palmquist (0-2)	#416	@ SEA	Logan Gilbert (11-7)	#13
Sun, Jul 5th	@ WSH	Cade Cavalli (12-5)	#61	@ SEA	Emerson Hancock (7-8)	#65
Tue, Jul 7th	vs ATL	Hurston Waldrep (0-1)		@ SF	Trevor McDonald (3-7)
Wed, Jul 8th	vs ATL	Grant Holmes (9-5)	#196	@ SF	Logan Webb (8-8)	#21
Thu, Jul 9th	vs ATL	Bryce Elder (8-7)	#187
Sat, Jul 11th	vs MIL	Shane Drohan (7-5)	#115	@ SD	Walker Buehler (8-6)	#212
Sun, Jul 12th	vs MIL	Robert Gasser (4-5)	#98	@ SD	German Marquez (4-2)	#423
Sat, Jul 18th	@ CLE	Logan Allen (0-0)	#174	vs CWS	Davis Martin (9-6)	#121
Sun, Jul 19th	@ CLE	Joey Cantillo (9-7)	#79	vs CWS	Sean Burke (7-6)	#78
Mon, Jul 20th	@ NYY	Ryan Weathers (5-8)	#233	vs TB	Nick Martinez (13-4)	#71
Wed, Jul 22nd	@ NYY	Max Fried (4-4)	#17	vs TB	Griffin Jax (6-9)	#86
Fri, Jul 24th	vs CHC	Matthew Boyd (8-3)	#43	@ BOS	Patrick Sandoval (1-3)	#125
Sat, Jul 25th	vs CHC	Shota Imanaga (8-9)	#29	@ BOS	Sonny Gray (16-4)	#25
Sun, Jul 26th	vs CHC	Jameson Taillon (2-6)	#179	@ BOS	Ranger Suarez (5-3)	#30
Mon, Jul 27th	vs ARI	Merrill Kelly (9-12)	#129	@ WSH	Eddy Yean (0-1)	#383
Tue, Jul 28th	vs ARI	Brandon Pfaadt (7-1)	#76	@ WSH	Cade Cavalli (12-5)	#61
Wed, Jul 29th	vs ARI	Eduardo Rodriguez (14-4)	#82	@ WSH	Zack Littell (8-8)	#276
Thu, Jul 30th	@ CIN	Rhett Lowder (6-8)	#219
Fri, Jul 31st	@ CIN	Hunter Greene (2-2)		vs STL	Kyle Leahy (10-4)	#96
Sat, Aug 1st	@ CIN	Andrew Abbott (6-10)	#90	vs STL	Quinn Mathews (1-2)	#170
Sun, Aug 2nd	@ CIN	Chase Burns (14-3)	#22	vs STL	Matthew Liberatore (5-12)	#100
Mon, Aug 3rd	@ MIL	Brandon Sproat (3-7)	#163	@ HOU	Cristian Javier (1-5)	#158
Tue, Aug 4th	@ MIL	Logan Henderson (9-2)	#28	@ HOU	Hayden Wesneski (4-1)	#94
Wed, Aug 5th	@ MIL	Kyle Harrison (10-3)	#54	@ HOU	Hunter Brown (4-3)	#26
Thu, Aug 6th	@ MIL	Dustin May (6-8)	#44	@ CHC	David Peterson (7-7)	#75
Fri, Aug 7th	vs NYM	Zac Thornton (3-4)	#137	@ PHI	Zack Wheeler (10-5)	#12
Sat, Aug 8th	vs NYM	Robert Stock (0-3)	#205	@ PHI	Aaron Nola (5-10)	#47
Sun, Aug 9th	vs NYM	Sean Manaea (4-6)	#58	@ PHI	Jesus Luzardo (12-5)	#9
Tue, Aug 11th	@ MIA	Eury Perez (7-10)	#50	vs BOS	Patrick Sandoval (1-3)	#125
Wed, Aug 12th	@ MIA	Janson Junk (6-8)	#117	vs BOS	Ranger Suarez (5-3)	#30
Thu, Aug 13th	@ MIA	Tyler Phillips (3-6)	#236	vs BOS	Payton Tolle (8-6)	#27
Fri, Aug 14th	vs BOS	Jake Bennett (9-6)	#92	vs NYY	Gerrit Cole (7-7)	#19
Sat, Aug 15th	vs BOS	Sonny Gray (16-4)	#25	vs NYY	Cam Schlittler (12-6)	#14
Sun, Aug 16th	vs BOS	Patrick Sandoval (1-3)	#125	vs NYY	Ryan Weathers (5-8)	#233
Mon, Aug 17th	vs DET	Framber Valdez (8-9)	#45
Tue, Aug 18th	vs DET	Keider Montero (9-8)	#148	@ TB	Nick Martinez (13-4)	#71
Wed, Aug 19th	vs DET	Jackson Jobe (1-1)	#189	@ TB	Drew Rasmussen (14-5)	#15
Fri, Aug 21st	@ LAD	Yoshinobu Yamamoto (12-8)	#8	@ NYY	Cam Schlittler (12-6)	#14
Sat, Aug 22nd	@ LAD	Tarik Skubal (8-7)	#2	@ NYY	Ryan Weathers (5-8)	#233
Sun, Aug 23rd	@ LAD	Blake Snell (2-1)	#16	@ NYY	Carlos Rodon (4-3)	#42
Mon, Aug 24th	@ SD	Robbie Ray (11-7)	#83
Tue, Aug 25th	@ SD	Michael King (8-9)	#55	vs KC	Seth Lugo (6-7)	#155
Wed, Aug 26th	@ SD	Randy Vasquez (10-6)	#252	vs KC	Randy Dobnak (2-2)	#433
Fri, Aug 28th	@ STL	Quinn Mathews (1-2)	#170	vs SEA	Emerson Hancock (7-8)	#65
Sat, Aug 29th	@ STL	Kyle Leahy (10-4)	#96	vs SEA	Kade Anderson (0-0)	#48
Sun, Aug 30th	@ STL	Matthew Liberatore (5-12)	#100	vs SEA	Logan Gilbert (11-7)	#13
Tue, Sep 1st	vs SF	Logan Webb (8-8)	#21	@ CLE	Gavin Williams (12-7)	#20
Wed, Sep 2nd	vs SF	Landen Roupp (8-13)	#74	@ CLE	Joey Cantillo (9-7)	#79
Thu, Sep 3rd	vs SF	Blade Tidwell (0-1)	#184	@ CLE	Tanner Bibee (5-14)	#46
Fri, Sep 4th	vs LAA	Reid Detmers (4-8)	#39	@ KC	Daniel Lynch (4-4)	#190
Sat, Sep 5th	vs LAA	Ryan Johnson (3-7)	#216	@ KC	Seth Lugo (6-7)	#155
Sun, Sep 6th	vs LAA	Yusei Kikuchi (0-4)	#95	@ KC	Randy Dobnak (2-2)	#433
Tue, Sep 8th	@ CWS			@ ATH
Wed, Sep 9th	@ CWS			@ ATH
Thu, Sep 10th	@ CWS
Fri, Sep 11th	@ CHC			vs BAL
Sat, Sep 12th	@ CHC			vs BAL
Sun, Sep 13th	@ CHC			vs BAL
Tue, Sep 15th	vs MIL			vs DET
Wed, Sep 16th	vs MIL			vs DET
Thu, Sep 17th	vs MIL
Fri, Sep 18th	vs KC			@ TEX
Sat, Sep 19th	vs KC			@ TEX
Sun, Sep 20th	vs KC			@ TEX
Tue, Sep 22nd	vs STL			@ BAL
Wed, Sep 23rd	vs STL			@ BAL
Thu, Sep 24th	vs STL
Fri, Sep 25th	@ DET			vs CIN
Sat, Sep 26th	@ DET			vs CIN
Sun, Sep 27th	@ DET			vs CIN
Fri, Mar 27th				vs ATH	Luis Severino (2-6)
Mon, Apr 20th				@ LAA	Reid Detmers (4-8)	#39
Mon, May 4th				@ TB	Nick Martinez (13-4)	#71
Mon, May 11th				vs TB	Drew Rasmussen (14-5)	#15
Mon, May 18th				@ NYY	Ryan Weathers (5-8)	#233
Mon, Jun 8th				vs PHI	Cristopher Sanchez (16-4)	#3
Thu, Jun 18th				@ BOS	Sonny Gray (16-4)	#25
Mon, Jun 22nd				vs HOU	Hunter Brown (4-3)	#26
Mon, Jul 6th				@ SF	Landen Roupp (8-13)	#74
Fri, Jul 10th				@ SD	JP Sears (3-4)	#275
Fri, Jul 17th				vs CWS	Anthony Kay (9-6)	#173
Tue, Jul 21st				vs TB	Drew Rasmussen (14-5)	#15
Thu, Jul 23rd				vs TB	Casey Legumina (2-2)	#180
Mon, Aug 10th				vs BOS	Sonny Gray (16-4)	#25
Thu, Aug 20th				@ TB	Ian Seymour (9-5)	#66
Thu, Aug 27th				vs KC	Noah Cameron (9-8)	#67
Mon, Sep 7th				@ ATH	Jacob Lopez (5-4)	#175
Mon, Sep 14th				vs DET
Mon, Sep 21st				@ BAL