Who Should I Trade?

Jhonathan Diaz for Riley O'Brien (2026)

Summary
Stats
Projections
News & Notes
Schedule

Who Should I Trade? Player Summaries
	Experts' Pick
	Riley O'Brien RP - STL	Jhonathan Diaz RP - SEA
Expert Recommendation	100% Recommended by 6 of 6 experts	0% Recommended by 0 of 6 experts
Rankings

Rest of Season	# 71	‐
VBR	# 315	# 981

Projections

Strikeouts	26	4
Wins	1	0
Saves	11	0
ERA	3.73	3.66
WHIP	1.39	1.29

Misc

Injury Alert	-	MiLB

Expert Ranks

Scott Pianowski Yahoo! Sports	# 62	‐

Dalton Del Don The Deep Shot	# 72	‐

Chris Welsh FantasyPros	# 78	‐

Mike Maher BettingPros	# 76	‐

Kelly Kirby FantasyPros	# 119	‐

Kevin Spinelli KevScores	# 96	‐

Who Should I Trade? Player Statistics
	Riley O'Brien RP - STL	Jhonathan Diaz RP - SEA
2026 Stats


Games Played	40	‐

Games Started	0	‐

Innings Pitched	40.1	‐

Wins	3	‐

Losses	3	‐

Saves	25	‐

Blown Saves	4	‐

Holds	1	‐

Hits Allowed	32	‐

Earned Runs	15	‐

Home Runs Allowed	2	‐

Strikeouts	40	‐

Walks	14	‐

ERA	3.35	‐

WHIP	1.14	‐

Who Should I Trade? Player Projections
	Riley O'Brien RP - STL	Jhonathan Diaz RP - SEA
2026 Projections


Games Played	28	10

Games Started	0	1

Innings Pitched	25.4	4.9

Wins	1	0

Losses	1	0

Saves	11	0

Blown Saves	0	0

Holds	2	0

Hits Allowed	23	5

Earned Runs	11	2

Home Runs Allowed	2	1

Strikeouts	26	4

Walks	11	1

ERA	3.73	3.66

WHIP	1.39	1.29

Who Should I Trade? Player Notes
	Riley O'Brien RP - STL	Jhonathan Diaz RP - SEA
News
	Riley O'Brien allowed one hit and one walk while striking out one in a scoreless appearance to earn the save in a 5-4 win over the Diamondbacks. Chase Davis Sat, Jul 18th	Lefthander Jhonathan Diaz has been reassigned to minor league camp by the Seattle Mariners. David Leisering Fri, Mar 20th
	Riley O'Brien struck out one batter while allowing no hits and one walk in a scoreless outing to earn the save in Saturday's 4-1 win over Atlanta. Chase Davis Sun, Jul 12th	The Mariners have signed left-hander Jhonathan Diaz to a minor-league deal. Brenton Kemp Tue, Feb 10th
	Riley O'Brien struck out two batters in a scoreless outing to earn the save in Friday's 2-1 win over the Braves. Chase Davis Sat, Jul 11th	The Mariners have outrighted left-hander Jhonathan Diaz to Triple-A Tacoma. Brenton Kemp Wed, Jan 28th
	Riley O'Brien struck out one batter while allowing one walk over a scoreless frame to earn the save in Saturday's 3-0 win over the Cubs. Chase Davis Sun, Jul 5th	The Mariners designated LHP Jhonathan Díaz for assignment. Ari Koslow Fri, Jan 23rd
	Riley O'Brien allowed one hit in a scoreless frame to earn the save in Tuesday's 5-3 win over Atlanta. Chase Davis Wed, Jul 1st
Notes
There are no recent notes for these players

Who Should I Trade? Player Schedules
Date	Opp	Opp Pitcher	VBR	Opp	Opp Pitcher	VBR
	Riley O'Brien RP - STL			Jhonathan Diaz RP - SEA
Thu, Mar 26th	vs TB	Drew Rasmussen (7-5)	#20	vs CLE	Tanner Bibee (3-9)	#44
Fri, Mar 27th				vs CLE	Gavin Williams (10-5)	#26
Sat, Mar 28th	vs TB	Joe Boyle (0-1)	#167	vs CLE	Joey Cantillo (8-4)	#83
Sun, Mar 29th	vs TB	Steven Matz (4-4)	#197	vs CLE	Slade Cecconi (4-6)	#112
Mon, Mar 30th	vs NYM	Clay Holmes (4-4)	#111	vs NYY	Ryan Weathers (3-7)	#46
Tue, Mar 31st	vs NYM	Kodai Senga (0-7)	#152	vs NYY	Max Fried (4-3)	#28
Wed, Apr 1st	vs NYM	Freddy Peralta (5-8)	#35	vs NYY	Cam Schlittler (9-5)	#19
Fri, Apr 3rd	@ DET	Framber Valdez (5-6)	#29	@ LAA	Reid Detmers (3-6)	#36
Sat, Apr 4th	@ DET	Jack Flaherty (3-8)	#54	@ LAA	Jack Kochanowicz (2-5)
Sun, Apr 5th	@ DET	Keider Montero (6-5)	#157	@ LAA	George Klassen (0-1)	#318
Mon, Apr 6th	@ WSH	Zack Littell (7-7)	#168	@ TEX	Jacob deGrom (7-5)	#9
Tue, Apr 7th	@ WSH	Cade Cavalli (6-4)	#68	@ TEX	Nathan Eovaldi (9-7)	#17
Wed, Apr 8th	@ WSH	Miles Mikolas (3-7)	#312	@ TEX	MacKenzie Gore (6-8)	#37
Fri, Apr 10th	vs BOS	Connelly Early (7-5)	#143	vs HOU	Tatsuya Imai (5-4)	#135
Sat, Apr 11th	vs BOS	Ranger Suarez (4-3)	#24	vs HOU	Lance McCullers Jr. (2-3)	#189
Sun, Apr 12th	vs BOS	Brayan Bello (2-6)	#141	vs HOU	Cody Bolton (0-1)	#328
Mon, Apr 13th	vs CLE	Gavin Williams (10-5)	#26	vs HOU	Mike Burrows (4-9)	#181
Tue, Apr 14th	vs CLE	Joey Cantillo (8-4)	#83	@ SD	Michael King (6-7)	#51
Wed, Apr 15th	vs CLE	Slade Cecconi (4-6)	#112	@ SD	Randy Vasquez (6-6)	#300
Thu, Apr 16th				@ SD	Walker Buehler (5-5)	#180
Fri, Apr 17th	@ HOU	Peter Lambert (8-5)	#164	vs TEX	Jacob deGrom (7-5)	#9
Sat, Apr 18th	@ HOU	Lance McCullers Jr. (2-3)	#189	vs TEX	Nathan Eovaldi (9-7)	#17
Sun, Apr 19th	@ HOU	Mike Burrows (4-9)	#181	vs TEX	MacKenzie Gore (6-8)	#37
Mon, Apr 20th	@ MIA	Max Meyer (9-1)	#42	vs ATH	J.T. Ginn (8-6)	#156
Tue, Apr 21st	@ MIA	Chris Paddack (0-7)		vs ATH	Jacob Lopez (4-3)	#204
Wed, Apr 22nd	@ MIA	Janson Junk (4-5)	#110	vs ATH	Aaron Civale (5-7)	#299
Fri, Apr 24th	vs SEA	George Kirby (7-8)	#18	@ STL	Andre Pallante (10-6)	#137
Sat, Apr 25th	vs SEA	Bryan Woo (7-6)	#13	@ STL	Matthew Liberatore (5-6)	#120
Sun, Apr 26th	vs SEA	Emerson Hancock (6-4)	#92	@ STL	Michael McGreevy (4-7)	#80
Mon, Apr 27th	@ PIT	Mason Montgomery (2-3)	#116	@ MIN	Connor Prielipp (2-5)	#128
Tue, Apr 28th	@ PIT	Braxton Ashcraft (9-3)	#25	@ MIN	Joe Ryan (6-5)	#14
Wed, Apr 29th	@ PIT	Bubba Chandler (3-8)	#129	@ MIN	Taj Bradley (9-4)	#48
Fri, May 1st	vs LAD	Emmet Sheehan (4-6)	#43	vs KC	Cole Ragans (1-4)
Sat, May 2nd	vs LAD	Roki Sasaki (3-5)	#117	vs KC	Seth Lugo (3-6)	#122
Sun, May 3rd	vs LAD	Justin Wrobleski (10-2)	#82	vs KC	Kris Bubic (3-2)	#131
Mon, May 4th	vs MIL	Chad Patrick (5-4)	#127	vs ATL	JR Ritchie (1-2)	#219
Tue, May 5th				vs ATL	Bryce Elder (5-6)	#124
Wed, May 6th	vs MIL	Brandon Sproat (3-4)	#125	vs ATL	Martin Perez (6-6)	#240
Fri, May 8th	@ SD	Griffin Canning (1-8)	#145	@ CWS	Sean Burke (6-4)	#87
Sat, May 9th	@ SD	Randy Vasquez (6-6)	#300	@ CWS	Anthony Kay (6-4)	#171
Sun, May 10th	@ SD	Walker Buehler (5-5)	#180	@ CWS	Davis Martin (9-5)	#100
Mon, May 11th				@ HOU	Peter Lambert (8-5)	#164
Tue, May 12th	@ ATH	Jeffrey Springs (3-9)	#183	@ HOU	Tatsuya Imai (5-4)	#135
Wed, May 13th	@ ATH	J.T. Ginn (8-6)	#156	@ HOU	Lance McCullers Jr. (2-3)	#189
Thu, May 14th	@ ATH	Jacob Lopez (4-3)	#204	@ HOU	Mike Burrows (4-9)	#181
Fri, May 15th	vs KC	Michael Wacha (5-7)	#72	vs SD	Randy Vasquez (6-6)	#300
Sat, May 16th	vs KC	Noah Cameron (5-7)	#77	vs SD	Walker Buehler (5-5)	#180
Sun, May 17th	vs KC	Stephen Kolek (4-3)	#177	vs SD	Lucas Giolito (2-3)	#344
Mon, May 18th				vs CWS	Noah Schultz (3-6)	#216
Tue, May 19th	vs PIT	Mitch Keller (6-7)	#113	vs CWS	Anthony Kay (6-4)	#171
Wed, May 20th	vs PIT	Carmen Mlodzinski (6-3)	#121	vs CWS	Sean Burke (6-4)	#87
Fri, May 22nd				@ KC	Noah Cameron (5-7)	#77
Sat, May 23rd	@ CIN	Chase Petty (1-2)	#389	@ KC	Stephen Kolek (4-3)	#177
Sun, May 24th				@ KC	Seth Lugo (3-6)	#122
Mon, May 25th	@ MIL	Jacob Misiorowski (10-4)	#6	@ ATH	Aaron Civale (5-7)	#299
Tue, May 26th	@ MIL	Kyle Harrison (8-2)	#58	@ ATH	Gage Jump (3-5)	#99
Wed, May 27th	@ MIL	Chad Patrick (5-4)	#127	@ ATH	Jeffrey Springs (3-9)	#183
Fri, May 29th	vs CHC	Shota Imanaga (5-8)	#30	vs ARI	Zac Gallen (3-9)	#172
Sat, May 30th	vs CHC	Ben Brown (4-2)	#91	vs ARI	Ryne Nelson (3-5)	#211
Sun, May 31st	vs CHC	Jordan Wicks (0-2)	#231	vs ARI	Merrill Kelly (7-8)	#118
Mon, Jun 1st	vs TEX	Jacob deGrom (7-5)	#9	vs NYM	Austin Warren
Tue, Jun 2nd	vs TEX	Nathan Eovaldi (9-7)	#17	vs NYM	Huascar Brazoban (4-2)	#203
Wed, Jun 3rd	vs TEX	MacKenzie Gore (6-8)	#37	vs NYM	Freddy Peralta (5-8)	#35
Fri, Jun 5th	vs CIN	Brady Singer (4-9)	#159	@ DET	Framber Valdez (5-6)	#29
Sat, Jun 6th	vs CIN	Nick Lodolo (3-2)	#101	@ DET	Keider Montero (6-5)	#157
Sun, Jun 7th	vs CIN	Rhett Lowder (3-7)	#210	@ DET	Jack Flaherty (3-8)	#54
Mon, Jun 8th				@ BAL	Trey Gibson (1-3)	#305
Tue, Jun 9th	@ NYM	Freddy Peralta (5-8)	#35	@ BAL	Trevor Rogers (6-7)	#78
Wed, Jun 10th	@ NYM	Austin Warren		@ BAL	Brandon Young (7-2)	#134
Thu, Jun 11th	@ NYM	Christian Scott (3-1)	#66	@ BAL	Kyle Bradish (6-9)	#40
Fri, Jun 12th	@ MIN	Joe Ryan (6-5)	#14	@ WSH	Zack Littell (7-7)	#168
Sat, Jun 13th	@ MIN	Connor Prielipp (2-5)	#128	@ WSH	Cade Cavalli (6-4)	#68
Sun, Jun 14th	@ MIN	Taj Bradley (9-4)	#48	@ WSH	PJ Poulin (3-0)	#294
Tue, Jun 16th	vs SD	Michael King (6-7)	#51	vs BAL	Brandon Young (7-2)	#134
Wed, Jun 17th	vs SD	Bradgley Rodriguez (2-2)	#147	vs BAL	Kyle Bradish (6-9)	#40
Thu, Jun 18th	@ KC	Noah Cameron (5-7)	#77	vs BAL	Shane Baz (4-9)	#70
Fri, Jun 19th	@ KC	Seth Lugo (3-6)	#122	vs BOS	Ranger Suarez (4-3)	#24
Sat, Jun 20th				vs BOS	Connelly Early (7-5)	#143
Sun, Jun 21st	@ KC	Stephen Kolek (4-3)	#177	vs BOS	Payton Tolle (5-6)	#61
Tue, Jun 23rd	vs ARI	Eduardo Rodriguez (8-3)	#115	@ PIT	Mitch Keller (6-7)	#113
Wed, Jun 24th	vs ARI	Mitch Bratt (0-0)	#198	@ PIT	Braxton Ashcraft (9-3)	#25
Thu, Jun 25th				@ PIT	Bubba Chandler (3-8)	#129
Fri, Jun 26th	vs MIA	Max Meyer (9-1)	#42	@ CLE	Joey Cantillo (8-4)	#83
Sat, Jun 27th	vs MIA	Ryan Gusto (0-2)	#179	@ CLE	Slade Cecconi (4-6)	#112
Sun, Jun 28th	vs MIA	Tyler Phillips (2-4)	#276	@ CLE	Gavin Williams (10-5)	#26
Mon, Jun 29th				vs LAA	Ryan Johnson (1-4)	#170
Tue, Jun 30th	@ ATL	Martin Perez (6-6)	#240	vs LAA	Jose Soriano (8-6)	#47
Thu, Jul 2nd	@ ATL	Hurston Waldrep (0-1)	#228	vs LAA	Walbert Urena (5-7)	#272
Fri, Jul 3rd	@ CHC	David Peterson (4-7)	#85	vs TOR	Dylan Cease (6-4)	#10
Sat, Jul 4th	@ CHC	Shota Imanaga (5-8)	#30	vs TOR	Shane Bieber (1-1)	#74
Sun, Jul 5th	@ CHC	Javier Assad (6-1)	#193	vs TOR	Trey Yesavage (4-4)	#84
Tue, Jul 7th	vs MIL	Robert Gasser (2-4)	#136	@ MIA	Max Meyer (9-1)	#42
Wed, Jul 8th	vs MIL	Kyle Harrison (8-2)	#58	@ MIA	Tyler Phillips (2-4)	#276
Thu, Jul 9th	vs MIL	Logan Henderson (3-1)	#56	@ MIA	Janson Junk (4-5)	#110
Fri, Jul 10th	vs ATL	Chris Sale (10-6)	#7	@ TB	Nick Martinez (8-2)	#88
Sat, Jul 11th	vs ATL	Reynaldo Lopez (4-2)	#76	@ TB	Griffin Jax (5-7)	#57
Sun, Jul 12th	vs ATL	Danny Young		@ TB	Ian Seymour (6-2)	#75
Fri, Jul 17th	@ ARI	Merrill Kelly (7-8)	#118	vs SF	Landen Roupp (7-8)	#59
Sat, Jul 18th	@ ARI	Brandon Pfaadt (4-1)	#79	vs SF	Logan Webb (5-7)	#15
Sun, Jul 19th	@ ARI	Eduardo Rodriguez (8-3)	#115	vs SF	Robbie Ray (8-6)	#86
Mon, Jul 20th	@ LAA	Jose Soriano (8-6)	#47	vs CIN	Andrew Abbott (5-5)	#90
Tue, Jul 21st	@ LAA	Walbert Urena (5-7)	#272	vs CIN	Chase Burns (11-1)	#22
Wed, Jul 22nd	@ LAA	Reid Detmers (3-6)	#36	vs CIN	Brady Singer (4-9)	#159
Fri, Jul 24th	vs CIN	Rhett Lowder (3-7)	#210	@ TEX	MacKenzie Gore (6-8)	#37
Sat, Jul 25th	vs CIN	Hunter Greene (1-1)	#16	@ TEX	Jacob deGrom (7-5)	#9
Sun, Jul 26th	vs CIN	Andrew Abbott (5-5)	#90	@ TEX	Nathan Eovaldi (9-7)	#17
Mon, Jul 27th	vs CHC	David Peterson (4-7)	#85	@ TEX	Jordan Montgomery	#234
Tue, Jul 28th	vs CHC			@ LAD
Wed, Jul 29th	vs CHC			@ LAD
Thu, Jul 30th	vs CHC			@ LAD
Fri, Jul 31st	@ TOR			vs MIN
Sat, Aug 1st	@ TOR			vs MIN
Sun, Aug 2nd	@ TOR			vs MIN
Tue, Aug 4th	@ NYY			vs DET
Wed, Aug 5th	@ NYY			vs DET
Thu, Aug 6th				vs DET
Fri, Aug 7th	vs COL			vs TB
Sat, Aug 8th	vs COL			vs TB
Sun, Aug 9th	vs COL			vs TB
Tue, Aug 11th	vs PHI			@ NYY
Wed, Aug 12th	vs PHI			@ NYY
Thu, Aug 13th				@ NYY
Fri, Aug 14th	@ CHC			@ HOU
Sat, Aug 15th	@ CHC			@ HOU
Sun, Aug 16th	@ CHC			@ HOU
Tue, Aug 18th	@ CIN			@ MIL
Wed, Aug 19th	@ CIN			@ MIL
Thu, Aug 20th	@ CIN			@ MIL
Fri, Aug 21st	@ PHI			vs CHC
Sat, Aug 22nd	@ PHI			vs CHC
Sun, Aug 23rd	@ PHI			vs CHC
Mon, Aug 24th				vs PHI
Tue, Aug 25th	vs BAL			vs PHI
Wed, Aug 26th	vs BAL			vs PHI
Fri, Aug 28th	vs PIT			@ TOR
Sat, Aug 29th	vs PIT			@ TOR
Sun, Aug 30th	vs PIT			@ TOR
Mon, Aug 31st				@ BOS
Tue, Sep 1st	@ LAD			@ BOS
Wed, Sep 2nd	@ LAD			@ BOS
Thu, Sep 3rd	@ LAD			vs ATH
Fri, Sep 4th	@ COL			vs ATH
Sat, Sep 5th	@ COL			vs ATH
Sun, Sep 6th	@ COL			vs ATH
Tue, Sep 8th	@ SF			vs TEX
Wed, Sep 9th	@ SF			vs TEX
Thu, Sep 10th				vs TEX
Fri, Sep 11th	vs CWS			@ ATH
Sat, Sep 12th	vs CWS			@ ATH
Sun, Sep 13th	vs CWS			@ ATH
Mon, Sep 14th	vs SF			@ LAA
Tue, Sep 15th	vs SF			@ LAA
Wed, Sep 16th	vs SF			@ LAA
Fri, Sep 18th	vs WSH			@ COL
Sat, Sep 19th	vs WSH			@ COL
Sun, Sep 20th	vs WSH			@ COL
Tue, Sep 22nd	@ PIT			vs HOU
Wed, Sep 23rd	@ PIT			vs HOU
Thu, Sep 24th	@ PIT			vs LAA
Fri, Sep 25th	@ MIL			vs LAA
Sat, Sep 26th	@ MIL			vs LAA
Sun, Sep 27th	@ MIL			vs LAA
Thu, Apr 30th	@ PIT	Paul Skenes (8-8)	#3
Thu, May 7th	@ SD	Michael King (6-7)	#51
Thu, May 21st	vs PIT	Braxton Ashcraft (9-3)	#25
Mon, Jun 15th	vs SD	Wandy Peralta (1-1)	#214
Mon, Jun 22nd	vs ARI	Merrill Kelly (7-8)	#118
Wed, Jul 1st	@ ATL	Reynaldo Lopez (4-2)	#76
Mon, Jul 6th	vs MIL	Shane Drohan (5-3)	#93
Thu, Jul 23rd	vs ARI	Brandon Pfaadt (4-1)	#79
Mon, Aug 3rd	@ NYY
Mon, Aug 10th	vs PHI
Mon, Aug 17th	@ CIN
Thu, Aug 27th	vs BAL
Mon, Sep 7th	@ SF

Who Should I Trade?

Jhonathan Diaz for Riley O'Brien (2026)

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