Justin Slaten or William Kempner

Baseball Stats Comparison

Stats
Projections
News & Notes
Schedule

Justin Slaten or William Kempner Player Statistics
	Justin Slaten RP - BOS	William Kempner RP - MIA
2026 Stats


Games Played	36	9

Games Started	0	0

Innings Pitched	31.1	12.1

Wins	2	1

Losses	4	0

Saves	0	0

Blown Saves	1	0

Holds	17	0

Hits Allowed	35	8

Earned Runs	16	4

Home Runs Allowed	4	1

Strikeouts	39	14

Walks	8	4

ERA	4.60	2.92

WHIP	1.37	0.97

Justin Slaten or William Kempner Player Projections
	Justin Slaten RP - BOS	William Kempner RP - MIA
2026 Projections


Games Played	54	21

Games Started	0	0

Innings Pitched	57.2	21.5

Wins	4	1

Losses	3	2

Saves	1	0

Blown Saves	1	0

Holds	12	1

Hits Allowed	53	20

Earned Runs	26	11

Home Runs Allowed	7	3

Strikeouts	54	21

Walks	19	12

ERA	4.14	4.71

WHIP	1.25	1.48

Justin Slaten or William Kempner Player Notes
	Justin Slaten RP - BOS	William Kempner RP - MIA
News
	Red Sox interim manager Chad Tracy said that Justin Slaten “still feels occasional elbow soreness.” Ari Koslow Wed, Sep 2nd	William Kempner has continued his non-throwing rehab. Ari Koslow Thu, Sep 3rd
	Justin Slaten is out to 120 feet playing catch. Ari Koslow Tue, Sep 1st	The Marlins transferred William Kempner to the 60-day injured list. Ari Koslow Fri, Aug 21st
	Justin Slaten had an MRI returned that showed no structural damage. Ari Koslow Tue, Aug 18th	William Kempner was scheduled to undergo surgery on Wednesday. Ari Koslow Thu, Aug 20th
	Red Sox interim manager Chad Tracy said Justin Slaten underwent an MRI on Monday. Ari Koslow Mon, Aug 17th	William Kempner is scheduled to undergo elbow surgery. Ari Koslow Wed, Aug 12th
	The Red Sox placed RHP Justin Slaten on the 15-day injured list with right elbow inflammation. Ari Koslow Sun, Aug 16th	The Marlins say William Kempner will be re-evaluated next week. Ari Koslow Fri, Aug 7th
Notes
There are no recent notes for these players

Justin Slaten or William Kempner Player Schedules
Date	Opp	Opp Pitcher	VBR	Opp	Opp Pitcher	VBR
	Justin Slaten RP - BOS			William Kempner RP - MIA
Thu, Mar 26th	@ CIN	Andrew Abbott (6-10)	#111
Sat, Mar 28th	@ CIN	Brady Singer (6-13)	#148	vs COL	Michael Lorenzen (3-12)	#121
Sun, Mar 29th	@ CIN	Rhett Lowder (6-10)	#195	vs COL	Jose Quintana (2-3)	#400
Mon, Mar 30th	@ HOU	Lance McCullers Jr. (2-3)		vs CWS	Davis Martin (9-7)	#101
Tue, Mar 31st	@ HOU	Hunter Brown (5-3)	#23	vs CWS	Erick Fedde (8-9)	#391
Wed, Apr 1st	@ HOU	Mike Burrows (4-9)	#242	vs CWS	Shane Smith (0-2)	#285
Fri, Apr 3rd	vs SD	Michael King (10-9)	#59	@ NYY	Will Warren (10-6)	#65
Sat, Apr 4th	vs SD	Randy Vasquez (10-6)	#166	@ NYY	Ryan Weathers (5-8)	#162
Sun, Apr 5th	vs SD	Walker Buehler (8-6)	#161	@ NYY	Max Fried (4-4)	#18
Mon, Apr 6th	vs MIL	Brandon Woodruff (2-2)		vs CIN	Brandon Williamson (3-4)	#405
Tue, Apr 7th	vs MIL	Jacob Misiorowski (14-5)	#8	vs CIN	Andrew Abbott (6-10)	#111
Wed, Apr 8th	vs MIL	Shane Drohan (7-5)	#93	vs CIN	Brady Singer (6-13)	#148
Fri, Apr 10th	@ STL	Dustin May (6-9)	#57	@ DET	Keider Montero (9-8)	#115
Sat, Apr 11th	@ STL	Kyle Leahy (10-4)	#85	@ DET	Casey Mize (5-9)	#48
Sun, Apr 12th	@ STL	Andre Pallante (12-6)	#109	@ DET	Tarik Skubal (9-7)	#2
Mon, Apr 13th	@ MIN	Bailey Ober (7-5)	#91	@ ATL	Grant Holmes (9-5)	#136
Tue, Apr 14th	@ MIN	Mick Abel (1-2)		@ ATL	Reynaldo Lopez (4-4)	#80
Wed, Apr 15th	@ MIN	Simeon Woods Richardson (2-7)		@ ATL	Bryce Elder (8-8)	#274
Fri, Apr 17th	vs DET	Casey Mize (5-9)	#48	vs MIL	Coleman Crow (0-1)	#204
Sat, Apr 18th	vs DET	Tarik Skubal (9-7)	#2	vs MIL	Brandon Woodruff (2-2)
Sun, Apr 19th	vs DET	Framber Valdez (9-10)	#42	vs MIL	Jacob Misiorowski (14-5)	#8
Mon, Apr 20th	vs DET	Jack Flaherty (3-8)	#87	vs STL	Michael McGreevy (6-9)	#102
Tue, Apr 21st	vs NYY	Luis Gil (1-2)	#260	vs STL	Dustin May (6-9)	#57
Wed, Apr 22nd	vs NYY	Max Fried (4-4)	#18	vs STL	Kyle Leahy (10-4)	#85
Thu, Apr 23rd	vs NYY	Cam Schlittler (13-6)	#17
Fri, Apr 24th	@ BAL	Brandon Young (9-4)	#120	@ SF	Adrian Houser (4-7)
Sat, Apr 25th	@ BAL	Trevor Rogers (10-9)	#50	@ SF	Robbie Ray (11-8)	#113
Sun, Apr 26th	@ BAL	Kyle Bradish (7-13)	#63	@ SF	Landen Roupp (9-13)	#98
Mon, Apr 27th	@ TOR	Dylan Cease (10-5)	#10	@ LAD	Yoshinobu Yamamoto (13-8)	#9
Tue, Apr 28th	@ TOR	Trey Yesavage (5-5)	#240	@ LAD	Shohei Ohtani (8-2)	#1
Wed, Apr 29th	@ TOR	Eric Lauer (8-7)	#350	@ LAD	Tyler Glasnow (4-0)	#16
Fri, May 1st	vs HOU	Mike Burrows (4-9)	#242	vs PHI	Zack Wheeler (12-5)	#12
Sat, May 2nd	vs HOU	Spencer Arrighetti (7-9)	#140	vs PHI	Andrew Painter (3-9)	#130
Sun, May 3rd	vs HOU	Cody Bolton (0-1)	#349	vs PHI	Jesus Luzardo (14-5)	#6
Mon, May 4th	@ DET	Tyler Holton (2-5)	#147	vs PHI	Aaron Nola (6-10)	#56
Tue, May 5th	@ DET	Framber Valdez (9-10)	#42	vs BAL	Chris Bassitt (6-5)	#139
Wed, May 6th	@ DET	Jack Flaherty (3-8)	#87	vs BAL	Brandon Young (9-4)	#120
Thu, May 7th	vs TB	Griffin Jax (7-10)	#25	vs BAL	Cade Povich (2-1)	#205
Fri, May 8th	vs TB	Jesse Scholtens (5-3)	#345	vs WSH	Foster Griffin (15-5)	#58
Sun, May 10th	vs TB	Nick Martinez (14-4)	#88	vs WSH	Cade Cavalli (12-5)	#41
Tue, May 12th	vs PHI	Zack Wheeler (12-5)	#12	@ MIN	Bailey Ober (7-5)	#91
Wed, May 13th	vs PHI	Andrew Painter (3-9)	#130	@ MIN	Simeon Woods Richardson (2-7)
Thu, May 14th	vs PHI	Jesus Luzardo (14-5)	#6	@ MIN	Zebby Matthews (9-10)	#89
Fri, May 15th	@ ATL	Spencer Strider (4-2)		@ TB	Ian Seymour (9-6)	#53
Sat, May 16th	@ ATL	Bryce Elder (8-8)	#274	@ TB	Nick Martinez (14-4)	#88
Sun, May 17th	@ ATL	Grant Holmes (9-5)	#136	@ TB	Drew Rasmussen (14-5)	#11
Mon, May 18th	@ KC	Seth Lugo (6-8)	#142	vs ATL	JR Ritchie (1-2)	#284
Tue, May 19th	@ KC	Bailey Falter (0-2)		vs ATL	Martin Perez (8-9)	#168
Wed, May 20th	@ KC	Michael Wacha (9-8)	#73	vs ATL	Chris Sale (14-9)	#4
Fri, May 22nd	vs MIN	Connor Prielipp (4-7)	#67	vs NYM	Tobias Myers (1-2)	#183
Sat, May 23rd	vs MIN	Taj Bradley (11-6)	#47	vs NYM	Freddy Peralta (8-11)	#45
Sun, May 24th	vs MIN	Bailey Ober (7-5)	#91	vs NYM	Christian Scott (4-4)	#49
Tue, May 26th	vs ATL	Spencer Strider (4-2)		@ TOR	Braydon Fisher (3-4)	#197
Wed, May 27th	vs ATL	Bryce Elder (8-8)	#274	@ TOR	Kevin Gausman (9-12)	#24
Thu, May 28th	vs ATL	Chris Sale (14-9)	#4
Fri, May 29th	@ CLE	Slade Cecconi (4-7)	#167	@ NYM	Freddy Peralta (8-11)	#45
Sat, May 30th	@ CLE	Parker Messick (11-9)	#35	@ NYM	Christian Scott (4-4)	#49
Sun, May 31st	@ CLE	Tanner Bibee (5-15)	#66	@ NYM	Nolan McLean (11-8)	#34
Tue, Jun 2nd	vs BAL	Shane Baz (6-15)	#71	@ WSH	Richard Lovelady (2-4)	#230
Wed, Jun 3rd	vs BAL	Chris Bassitt (6-5)	#139	@ WSH	Andrew Alvarez (2-6)	#123
Thu, Jun 4th	vs BAL	Trevor Rogers (10-9)	#50
Fri, Jun 5th	@ NYY	Ryan Weathers (5-8)	#162	vs TB	Drew Rasmussen (14-5)	#11
Sun, Jun 7th	@ NYY	Cam Schlittler (13-6)	#17	vs TB	Griffin Jax (7-10)	#25
Mon, Jun 8th	@ TB	Ian Seymour (9-6)	#53
Tue, Jun 9th	@ TB	Nick Martinez (14-4)	#88	vs ARI	Zac Gallen (3-9)	#128
Wed, Jun 10th	@ TB	Drew Rasmussen (14-5)	#11	vs ARI	Ryne Nelson (3-5)	#215
Fri, Jun 12th	vs TEX	Jack Leiter (3-7)	#185	@ PIT	Braxton Ashcraft (14-6)	#27
Sat, Jun 13th	vs TEX	Jacob deGrom (10-9)	#7	@ PIT	Bubba Chandler (7-9)	#116
Sun, Jun 14th	vs TEX	Nathan Eovaldi (10-9)	#127	@ PIT	Paul Skenes (10-11)	#5
Tue, Jun 16th	vs TOR	Dylan Cease (10-5)	#10	@ PHI	Jesus Luzardo (14-5)	#6
Wed, Jun 17th	vs TOR	Braydon Fisher (3-4)	#197	@ PHI	Andrew Painter (3-9)	#130
Thu, Jun 18th	vs TOR	Trey Yesavage (5-5)	#240
Fri, Jun 19th	@ SEA	Bryce Miller (4-9)	#52	vs SF	Landen Roupp (9-13)	#98
Sat, Jun 20th	@ SEA	Emerson Hancock (7-8)	#196	vs SF	Trevor McDonald (3-7)
Sun, Jun 21st	@ SEA	Logan Gilbert (12-9)	#13	vs SF	Logan Webb (8-8)	#29
Mon, Jun 22nd	@ COL	Ryan Feltner (5-10)	#403	vs TEX	Tyler Alexander (5-2)	#172
Tue, Jun 23rd	@ COL	Sean Sullivan (0-3)	#375	vs TEX	Cal Quantrill (8-5)	#159
Wed, Jun 24th	@ COL	Kyle Freeland (4-10)	#377	vs TEX	Jacob deGrom (10-9)	#7
Thu, Jun 25th	vs NYY	Cam Schlittler (13-6)	#17
Fri, Jun 26th	vs NYY	Will Warren (10-6)	#65	@ STL	Michael McGreevy (6-9)	#102
Sat, Jun 27th	vs NYY	Gerrit Cole (8-8)	#21	@ STL	Andre Pallante (12-6)	#109
Sun, Jun 28th	vs NYY	Carlos Rodon (5-3)	#43	@ STL	Kyle Leahy (10-4)	#85
Mon, Jun 29th	vs WSH	Miles Mikolas (3-9)		@ COL	Sean Sullivan (0-3)	#375
Tue, Jun 30th	vs WSH	Cade Cavalli (12-5)	#41	@ COL	Tanner Gordon (1-4)	#324
Wed, Jul 1st	vs WSH	Brad Lord (5-2)	#180	@ COL	Kyle Freeland (4-10)	#377
Fri, Jul 3rd	@ LAA	Reid Detmers (5-8)	#32	@ ATH	Jack Perkins (3-11)	#138
Sat, Jul 4th	@ LAA	Sam Aldegheri (3-4)	#355	@ ATH	Aaron Civale (6-7)	#175
Sun, Jul 5th	@ LAA	Ryan Johnson (4-8)	#155	@ ATH	Gage Jump (6-10)	#100
Tue, Jul 7th	@ CWS	Noah Schultz (3-9)	#357	vs SEA	Bryan Woo (11-9)	#14
Wed, Jul 8th	@ CWS	Davis Martin (9-7)	#101	vs SEA	George Kirby (9-11)	#26
Thu, Jul 9th	@ CWS	Anthony Kay (9-8)	#145	vs SEA	Bryce Miller (4-9)	#52
Fri, Jul 10th	@ NYM	Nolan McLean (11-8)	#34	vs CLE	Parker Messick (11-9)	#35
Sat, Jul 11th	@ NYM	Freddy Peralta (8-11)	#45	vs CLE	Tanner Bibee (5-15)	#66
Sun, Jul 12th	@ NYM	Zac Thornton (3-5)	#125	vs CLE	Joey Cantillo (9-9)	#70
Fri, Jul 17th	vs TB	Mason Englert (0-3)	#232	@ MIL	Logan Henderson (10-3)	#30
Sat, Jul 18th	vs TB	Ian Seymour (9-6)	#53	@ MIL	Shane Drohan (7-5)	#93
Sun, Jul 19th	vs TB	Shane McClanahan (10-7)	#176	@ MIL	Robert Gasser (4-5)	#81
Mon, Jul 20th	vs BAL	Shane Baz (6-15)	#71	@ HOU	Ronel Blanco (0-1)	#124
Wed, Jul 22nd	vs BAL	Kyle Bradish (7-13)	#63	@ HOU	Peter Lambert (8-8)	#135
Fri, Jul 24th	vs TOR	Trey Yesavage (5-5)	#240	vs SD	German Marquez (4-2)	#360
Sat, Jul 25th	vs TOR	Dylan Cease (10-5)	#10	vs SD	Randy Vasquez (10-6)	#166
Sun, Jul 26th	vs TOR	Kevin Gausman (9-12)	#24	vs SD	Walker Buehler (8-6)	#161
Mon, Jul 27th	@ ATH	Jack Perkins (3-11)	#138	vs PHI	Zack Wheeler (12-5)	#12
Tue, Jul 28th	@ ATH	Gage Jump (6-10)	#100	vs PHI	Aaron Nola (6-10)	#56
Wed, Jul 29th	@ ATH	Jacob Lopez (6-4)	#149	vs PHI	Jesus Luzardo (14-5)	#6
Thu, Jul 30th	@ ATH	Mason Barnett (1-4)	#401	@ NYM	Nolan McLean (11-8)	#34
Fri, Jul 31st	@ LAD	Edgardo Henriquez		@ NYM	Kodai Senga (0-9)	#103
Sat, Aug 1st	@ LAD	Yoshinobu Yamamoto (13-8)	#9	@ NYM	Zac Thornton (3-5)	#125
Sun, Aug 2nd	@ LAD	Emmet Sheehan (5-8)	#55	@ NYM	Robert Stock (1-3)	#278
Tue, Aug 4th	vs CWS	Davis Martin (9-7)	#101	@ ATL	Grant Holmes (9-5)	#136
Wed, Aug 5th	vs CWS	Sean Burke (8-7)	#64	@ ATL	Bryce Elder (8-8)	#274
Thu, Aug 6th	vs CWS	Luis Castillo (4-11)	#112	@ ATL	Martin Perez (8-9)	#168
Fri, Aug 7th	vs ATH	Jack Perkins (3-11)	#138	vs LAA	George Klassen (2-2)	#305
Sat, Aug 8th	vs ATH	Gage Jump (6-10)	#100	vs LAA	Walbert Urena (9-10)	#146
Sun, Aug 9th	vs ATH	J.T. Ginn (9-8)	#310	vs LAA	Grayson Rodriguez (4-7)	#86
Mon, Aug 10th	@ TOR	Jameson Taillon (2-6)
Tue, Aug 11th	@ TOR	Dylan Cease (10-5)	#10	vs PIT	Paul Skenes (10-11)	#5
Wed, Aug 12th	@ TOR	Jose Soriano (12-7)	#46	vs PIT	Carmen Mlodzinski (7-6)	#99
Thu, Aug 13th	@ TOR	Max Scherzer (2-7)	#105	vs PIT	Braxton Ashcraft (14-6)	#27
Fri, Aug 14th	@ PIT	Bubba Chandler (7-9)	#116	@ CIN	Chase Burns (15-3)	#31
Sat, Aug 15th	@ PIT	Jared Jones (4-6)	#44	@ CIN	Brady Singer (6-13)	#148
Sun, Aug 16th	@ PIT	Lake Bachar (1-3)	#201	@ CIN	Nick Lodolo (3-4)	#107
Mon, Aug 17th	vs ARI	Mitch Bratt (1-3)	#329	@ PHI	Cristopher Sanchez (17-5)	#3
Tue, Aug 18th	vs ARI	Merrill Kelly (9-13)	#134	@ PHI	Zack Wheeler (12-5)	#12
Wed, Aug 19th	vs ARI	Brandon Pfaadt (7-2)	#108	@ PHI	Aaron Nola (6-10)	#56
Fri, Aug 21st	vs SF	Logan Webb (8-8)	#29	vs WSH	Brad Lord (5-2)	#180
Sat, Aug 22nd	vs SF	Blade Tidwell (0-2)	#152	vs WSH	Jake Irvin (2-9)	#153
Sun, Aug 23rd	vs SF	Matt Wilkinson (1-3)	#263	vs WSH	Jackson Kent (1-4)	#151
Mon, Aug 24th	@ MIA	Sandy Alcantara (13-10)	#84	vs BOS	Ranger Suarez (6-4)	#38
Tue, Aug 25th	@ MIA	Tyler Phillips (5-6)	#157	vs BOS	Payton Tolle (9-6)	#28
Wed, Aug 26th	@ MIA	Ryan Gusto (1-4)	#126	vs BOS	Sonny Gray (17-4)	#36
Fri, Aug 28th	@ NYY	Cam Schlittler (13-6)	#17	@ WSH	Jackson Kent (1-4)	#151
Sat, Aug 29th	@ NYY	Max Fried (4-4)	#18	@ WSH	Cade Cavalli (12-5)	#41
Sun, Aug 30th	@ NYY	Will Warren (10-6)	#65	@ WSH	Andrew Alvarez (2-6)	#123
Mon, Aug 31st	vs SEA	George Kirby (9-11)	#26	@ WSH	Will Dion (1-2)	#202
Tue, Sep 1st	vs SEA	Bryan Woo (11-9)	#14	@ KC	Randy Dobnak (3-3)	#387
Wed, Sep 2nd	vs SEA	Bryce Miller (4-9)	#52	@ KC	Noah Cameron (9-8)	#75
Thu, Sep 3rd	@ BAL	Brandon Young (9-4)	#120	@ KC	Michael Wacha (9-8)	#73
Fri, Sep 4th	@ BAL	Shane Baz (6-15)	#71	vs CHC	Shota Imanaga (9-10)	#33
Sat, Sep 5th	@ BAL	Chris Bassitt (6-5)	#139	vs CHC	Javier Assad (6-1)	#253
Sun, Sep 6th	@ BAL	Kyle Bradish (7-13)	#63	vs CHC	Clay Holmes (6-7)	#69
Mon, Sep 7th	vs LAA	Grayson Rodriguez (4-7)	#86	vs NYM	Jonah Tong (2-1)	#104
Tue, Sep 8th	vs LAA	Reid Detmers (5-8)	#32	vs NYM	Sean Manaea (5-7)	#76
Wed, Sep 9th	vs LAA	Ryan Johnson (4-8)	#155	vs NYM	Robert Stock (1-3)	#278
Fri, Sep 11th	vs KC	Seth Lugo (6-8)	#142	vs LAD	Blake Snell (3-1)	#15
Sat, Sep 12th	vs KC	Randy Dobnak (3-3)	#387	vs LAD	Tyler Glasnow (4-0)	#16
Sun, Sep 13th	vs KC	Noah Cameron (9-8)	#75	vs LAD	Justin Wrobleski (11-5)	#158
Tue, Sep 15th	@ TEX	Cody Bradford (0-5)	#96	@ ARI	Zac Gallen (3-9)	#128
Wed, Sep 16th	@ TEX	Jacob deGrom (10-9)	#7	@ ARI	Merrill Kelly (9-13)	#134
Thu, Sep 17th	@ TEX	Kumar Rocker (5-11)	#114
Fri, Sep 18th	@ TB	Ian Seymour (9-6)	#53	@ SD	Nick Pivetta (2-2)	#37
Sat, Sep 19th	@ TB	Freddy Peralta (8-11)	#45	@ SD	Casey Mize (5-9)	#48
Sun, Sep 20th	@ TB	Griffin Jax (7-10)	#25	@ SD	Walker Buehler (8-6)	#161
Tue, Sep 22nd	vs CLE			@ CHC
Wed, Sep 23rd	vs CLE			@ CHC
Thu, Sep 24th	vs CLE			@ CHC
Fri, Sep 25th	vs CHC			vs ATL
Sat, Sep 26th	vs CHC			vs ATL
Sun, Sep 27th	vs CHC			vs ATL
Fri, Mar 27th				vs COL	Kyle Freeland (4-10)	#377
Thu, Apr 9th				vs CIN	Rhett Lowder (6-10)	#195
Sat, May 9th				vs WSH	Richard Lovelady (2-4)	#230
Thu, May 21st				vs ATL	Spencer Strider (4-2)
Mon, May 25th				@ TOR	Trey Yesavage (5-5)	#240
Mon, Jun 1st				@ WSH	Cade Cavalli (12-5)	#41
Sat, Jun 6th				vs TB	Shane McClanahan (10-7)	#176
Thu, Jun 11th				vs ARI	Merrill Kelly (9-13)	#134
Mon, Jun 15th				@ PHI	Zack Wheeler (12-5)	#12
Thu, Jul 2nd				@ COL	Michael Lorenzen (3-12)	#121
Tue, Jul 21st				@ HOU	Tatsuya Imai (6-4)	#94
Mon, Sep 14th				@ ARI	Corbin Burnes (0-0)	#54