This matchup features two teams heading in opposite directions, with Arizona riding a five-game winning streak while Seattle has found recent success against weaker Oakland pitching. The pitching duel between George Kirby and Zac Gallen heavily favors Seattle, as Kirby's 3.54 ERA and superior velocity metrics dwarf Gallen's struggles this season (4.80 ERA, 1.44 WHIP). However, Arizona's significantly better record (31-24 vs 28-29) and recent offensive surge cannot be ignored. The Diamondbacks have scored 42 runs during their current five-game winning streak, averaging over eight runs per game. Seattle's injury situation is concerning, particularly the absence of catcher Cal Raleigh and third baseman Brendan Donovan, which has forced roster shuffling that could impact their offensive rhythm. The recent activation of Victor Robles provides some stability, but his .292 average comes with limited power production. Arizona's lineup, despite missing Carlos Santana and Lourdes Gurriel Jr., still features the dynamic duo of Corbin Carroll (.293, 7 HR) and Ildemaro Vargas (.303, 7 HR, 35 RBI), who have been carrying the offensive load. The cool 52-degree weather and overcast conditions at T-Mobile Park typically suppress offensive numbers, which should benefit both starting pitchers but particularly helps Kirby's four-seam fastball and slider combination. Arizona's bullpen has been more reliable during their hot streak, and with Gabe Speier just activated for Seattle, there are questions about their late-game depth. The Diamondbacks' superior road performance during this winning streak, combined with their momentum and slightly better offensive health, gives them the edge in what projects to be a low-scoring affair.

Scoring Dynamics

Early (1-3) 2R Both starters settle after early runs allowed

Middle (4-6) 3R Isolated scoring as pitchers find rhythm

Late (7-9) 4R Arizona bullpen advantage shows in late innings

Matchup Analysis

Mariners

George Kirby's velocity and spin rate

Strong recent offensive form against Oakland

Home field advantage at T-Mobile Park

Missing key players Cal Raleigh and Brendan Donovan

Inconsistent home record (14-15)

Diamondbacks

Superior record and momentum (W5 streak)

Ildemaro Vargas and Corbin Carroll leading offense

Better road performance recently

Zac Gallen's elevated ERA and WHIP

Missing several key offensive pieces to injury

Risk Factors

Cool weather affecting ball flight

Both teams missing key offensive contributors

Key Matchups

Randy Arozarena vs Zac Gallen batter Arozarena's .295 average vs Gallen's 4.80 ERA

Corbin Carroll vs George Kirby pitcher Kirby's slider effectiveness against left-handed speed

Ildemaro Vargas vs George Kirby batter Vargas leading Arizona offense with .303 average

Statistical Edges

First to Score Diamondbacks 62%

Strikeouts 14 11-17

Total Runs 9 7-11

Game Preview

The game begins with Zac Gallen struggling with his command in the chilly Pacific Northwest evening, walking Randy Arozarena to lead off before allowing an RBI single to put Arizona ahead 1-0. George Kirby responds by settling into a groove, using his improved velocity to retire the Mariners in order through the first two innings. Seattle answers in the second when Victor Robles works a leadoff walk and eventually scores on a Patrick Wisdom sacrifice fly to even the score at 1-1. Both pitchers find their rhythm through the middle innings, with Kirby's slider particularly effective against Arizona's left-handed hitters. The Diamondbacks break through in the third when Corbin Carroll steals second base and scores on an Ildemaro Vargas double down the left-field line. Seattle's best scoring opportunity comes in the fourth inning when they load the bases with one out, but Gallen escapes with only two runs allowed on a Randy Arozarena two-run single, giving the Mariners a brief 3-2 lead. The game turns in the sixth inning when Arizona capitalizes on Seattle's bullpen transition, scoring on a Gabriel Moreno RBI groundout to tie the game 3-3. The decisive moment comes in the eighth inning when the Diamondbacks string together three consecutive hits against Seattle's overworked relief corps, with Carroll and Vargas delivering back-to-back RBI singles to take a 5-3 lead. Arizona's closer secures the final three outs despite a late Seattle rally attempt, completing the Diamondbacks' sixth consecutive victory and maintaining their strong position in the NL West race.

The confidence level reflects Arizona's superior recent form and momentum versus Seattle's pitching advantage with Kirby. While Kirby should outperform Gallen significantly, Arizona's hot offense and bullpen edge in late innings provides the decisive factor.

Probable Pitchers

Z. Gallen Diamondbacks

Arizona Diamondbacks — Roster

Player	Pos	AVG	HR	RBI	OBP	SLG
Ketel Marte	2B	.271	9	32	.326	.467
Corbin Carroll	RF	.294	7	28	.390	.546
Geraldo Perdomo	SS	.232	3	21	.341	.362
Gabriel Moreno	C	.268	3	19	.325	.420
Tim Tawa	DH	.175	1	8	.273	.263
Ryan Waldschmidt	CF	.294	0	7	.351	.397
Ildemaro Vargas	1B	.295	7	37	.322	.472
Jose Fernandez	3B	.268	3	15	.301	.376
Tommy Troy	LF	.313	0	0	.421	.438

Seattle Mariners — Roster

Player	Pos	AVG	HR	RBI	OBP	SLG
J.P. Crawford	SS	.218	9	22	.344	.397
Julio Rodríguez	CF	.265	11	29	.323	.457
Josh Naylor	1B	.258	5	24	.323	.352
Randy Arozarena	LF	.297	6	26	.382	.467
Victor Robles	RF	.292	0	1	.292	.375
Cole Young	2B	.243	3	27	.320	.347
Rob Refsnyder	DH	.120	3	8	.198	.240
Mitch Garver	C	.203	2	6	.353	.319
Colt Emerson	3B	.229	1	6	.325	.457

Scoring Plays

▼ 1

J.P. Crawford homers (8) on a fly ball to right field.

0-1

▼ 3

Julio Rodríguez homers (11) on a line drive to left field. J.P. Crawford scores.

0-3

▲ 4

Geraldo Perdomo homers (3) on a fly ball to right field.

1-3

▼ 5

J.P. Crawford homers (9) on a fly ball to center field. Jhonny Pereda scores.

1-5

▲ 6

Gabriel Moreno doubles (8) on a sharp line drive to center fielder Julio Rodríguez. Corbin Carroll scores. Geraldo Perdomo scores.

3-5

▲ 6

Ildemaro Vargas grounds into a force out, first baseman Josh Naylor to shortstop J.P. Crawford. Gabriel Moreno scores. Adrian Del Castillo to 3rd. Ryan Waldschmidt out at 2nd. Ildemaro Vargas to 1st.

4-5

▲ 6

Jose Fernandez singles on a line drive to right fielder Luke Raley. Adrian Del Castillo scores. Ildemaro Vargas to 3rd.

5-5

▼ 6

Luke Raley homers (12) on a fly ball to right field.

5-6

▲ 9

Ildemaro Vargas reaches on a fielder's choice, fielded by first baseman Josh Naylor. Geraldo Perdomo scores. Gabriel Moreno to 3rd. Tim Tawa to 2nd.

6-6

▼ 10

Randy Arozarena doubles (16) on a line drive to center fielder Ryan Waldschmidt. J.P. Crawford scores. Josh Naylor to 3rd.

6-7

Arizona Diamondbacks — Batting

Player	AB	R	H	RBI	BB	K	HR	AVG	OPS
Ketel Marte2B	4	0	0	0	2	1	0	.271	.793
Corbin CarrollRF	6	1	2	0	0	1	0	.294	.936
Geraldo PerdomoSS	6	3	3	1	0	0	1	.232	.703
Gabriel MorenoC	5	1	3	2	0	0	0	.268	.745
Tim TawaDH	0	0	0	0	0	0	0	.175	.536
Ryan WaldschmidtCF	5	0	1	0	0	2	0	.294	.748
Ildemaro Vargas1B	5	0	0	2	0	0	0	.295	.794
Jose Fernandez3B	5	0	3	1	0	0	0	.268	.677
Tommy TroyLF	4	0	0	0	1	2	0	.313	.859
Totals	43	6	13	6	4	7	1

BATTING

2B: Fernandez, Jo 2 (7, Kirby, Bazardo); Perdomo (9, Kirby); Moreno (8, Kirby).

HR: Perdomo (3, 4th inning off Kirby, 0 on, 0 out).

TB: Arenado; Carroll 2; Fernandez, Jo 5; Moreno 4; Perdomo 7; Waldschmidt.

RBI: Fernandez, Jo (15); Moreno 2 (19); Perdomo (21); Vargas, I 2 (37).

2-out RBI: Fernandez, Jo.

Runners left in scoring position, 2 out: Troy 2; Marte, K 2; Waldschmidt; Carroll 2; Perdomo.

Team RISP: 3-for-17.

Team LOB: 13.

FIELDING

Outfield assists: Waldschmidt (Naylor, J at 2nd base).

DP: 2 (Marte, K-Perdomo-Vargas, I; Perdomo-Vargas, I).

a-Singled for Del Castillo in the 7th.

1-Ran for Arenado in the 9th.

Seattle Mariners — Batting

Player	AB	R	H	RBI	BB	K	HR	AVG	OPS
J.P. CrawfordSS	4	4	2	3	1	1	2	.218	.741
Julio RodríguezCF	5	1	3	2	0	1	1	.265	.780
Josh Naylor1B	4	0	1	0	1	0	0	.258	.675
Randy ArozarenaLF	5	0	2	1	0	0	0	.297	.849
Victor RoblesRF	0	0	0	0	0	0	0	.292	.667
Cole Young2B	4	0	1	0	0	0	0	.243	.667
Rob RefsnyderDH	1	0	0	0	0	1	0	.120	.438
Mitch GarverC	0	0	0	0	0	0	0	.203	.672
Colt Emerson3B	4	0	0	0	0	3	0	.229	.782
Totals	38	7	13	7	2	9	4

BATTING

2B: Rodríguez, J (12, Pfaadt); Arozarena (16, Morillo, J).

HR: Crawford, J 2 (9, 1st inning off Gallen, 0 on, 0 out, 5th inning off Gallen, 1 on, 1 out); Rodríguez, J (11, 3rd inning off Gallen, 1 on, 2 out); Raley, L (12, 6th inning off Pfaadt, 0 on, 1 out).

TB: Arozarena 3; Crawford, J 8; Naylor, J; Pereda; Raley, L 5; Rodríguez, J 7; Wisdom; Young.

RBI: Arozarena (26); Crawford, J 3 (22); Raley, L (30); Rodríguez, J 2 (29).

2-out RBI: Rodríguez, J 2.

Runners left in scoring position, 2 out: Naylor, J.

GIDP: Canzone; Naylor, J.

Team RISP: 2-for-6.

Team LOB: 6.

BASERUNNING

SB: Arozarena (15, 2nd base off Gallen/Moreno).

FIELDING

DP: (Young-Naylor, J).

a-Struck out for Canzone in the 9th.

b-Singled for Pereda in the 9th.

Arizona Diamondbacks — Pitching

Pitcher	IP	H	R	ER	BB	K	HR	PC-ST	ERA
Zac Gallen	5.0	8	5	5	1	2	3	84-53	5.16
Brandon Pfaadt	1.2	3	1	1	0	3	1	31-20	5.59
Taylor Clarke	0.1	0	0	0	0	0	0	4-3	1.96
Jonathan Loáisiga	1.0	0	0	0	0	1	0	16-13	2.53
Brandyn Garcia	1.0	1	0	0	0	2	0	16-10	0.90
Juan Morillo(L, 1-2)	0.1	1	1	0	1	1	0	9-6	2.86

Seattle Mariners — Pitching

Pitcher	IP	H	R	ER	BB	K	HR	PC-ST	ERA
George Kirby	5.1	6	4	4	1	4	1	87-61	3.77
Matt Brash(BS, 2)	0.2	2	1	1	2	1	0	22-11	0.64
José A. Ferrer(H, 7)	0.2	1	0	0	0	0	0	12-9	1.75
Eduard Bazardo(H, 10)	1.0	2	0	0	1	0	0	27-15	2.13
Gabe Speier(H, 6)	0.1	0	0	0	0	1	0	3-3	2.63
Andrés Muñoz(BS, 4)	1.0	2	1	1	0	1	0	25-16	4.98
Cooper Criswell(W, 2-1)	1.0	0	0	0	0	0	0	9-7	3.20

Game Info

Umpires: Home Plate: Chris Guccione; First Base: David Rackley; Second Base: Nestor Ceja; Third Base: Louie Krupa

Venue: T-Mobile Park, Seattle

Weather: 58°F, Roof Closed

Wind: 5 mph, In From LF

Arizona Diamondbacks — News

D-Backs' Cristian Mena To Undergo Shoulder Surgery

Mena has no 2026 appearance on record, suggesting this surgery ends what was already a lost season for Arizona's rotation depth. Arizona's pitching staff will need to absorb another extended absence from its relief corps.

Cristian Mena

Diamondbacks Release Joe Ross

Ross never made it past his initial stint, posting a 19.64 ERA in limited action before the D-backs moved him back to Triple-A and released him.

Joe Ross

Arizona Diamondbacks

D-Backs Trade Alek Thomas To Dodgers

Thomas is hitting .181 with a .292 xwOBA across 14 games—well below replacement level—so Arizona is dumping salary rather than addressing a need. LAD adds depth to an outfield while maintaining their +63 run differential and 24-17 record.

Alek Thomas

Los Angeles Dodgers

Diamondbacks Designate Alek Thomas For Assignment, Promote Ryan Waldschmidt

Thomas departs with a .181 AVG, .292 xwOBA, and 15 SO in 14 games—metrics that suggest Arizona's patience with the former prospect had run out. Waldschmidt's promotion signals a youth movement in the outfield despite the D-backs' likely push for contention in a competitive NL West.

Alek Thomas

Ryan Waldschmidt

Arizona Diamondbacks

D-backs Designate Aramis Garcia For Assignment

Moreno returns from the IL with a .275 AVG and .336 xwOBA through 13 games, stabilizing Arizona's catching position. Garcia's designation clears roster depth as the Snakes activate Brandyn Garcia from Triple-A.

Brandyn Garcia

Aramis Garcia

Arizona Diamondbacks

Seattle Mariners — News

Mariners extend win streak to 7 with 2nd consecutive walk-off

Seattle (32-29, +31 run diff) has won 8 of last 10 and climbed to AL West lead despite ranking last in the division 10 games ago. Logan Gilbert (3.69 ERA, 3-4) starts today against NYM, with the Mariners' pitching staff anchored by Hancock (2.80 ERA, 4-2) and Woo (3.44 ERA, 5-3).

Logan Gilbert

Seattle Mariners

Mariners adopt six-man rotation for 16 games in 17 days

Seattle (29-29, +25 run differential) shifts to a six-man rotation with Bryce Miller starting and Luis Castillo piggyback-pitching Sunday, managing a brutal stretch that requires depth across their full staff. Hancock (2.78 ERA, 4-2) remains their most efficient starter, while Gilbert (3.69 ERA, 5-4) and Kirby (3.77 ERA, 5-4) anchor the rotation alongside the piggyback approach.

Luis Castillo

Bryce Miller

Seattle Mariners

Texas Rangers

Kurtz extends on-base streak to 47 games, chases McGwire A's record

Oakland's first baseman sits one game behind Mark McGwire's franchise record; Athletics (27-26, 5-5 L10) host Seattle tonight with Civale (3.31 ERA, 5-1) facing a Mariners rotation averaging 3.85 ERA (Kirby, Woo, Gilbert, Hancock) that's won only 4 of last 10.

Athletics

Seattle Mariners

Los Angeles Dodgers

Mariners Notes: Crawford, Rotation, Castillo

Crawford is batting .204/.362/.354 (107 wRC+ career) across 43 games, well below his historical average, while the Seattle rotation remains intact with Kirby (3.45 ERA, 5-3) and Woo (3.51 ERA, 4-2) leading a solid foursome. Castillo's 6.41 ERA and .366 xwOBA suggest he remains unavailable or struggling significantly.

Seattle Mariners

Mariners Recall Robinson Ortiz, Reinstate Patrick Wisdom

Ortiz makes his MLB debut as Seattle's rotation remains anchored by Hancock (3.02 ERA, 0.316 xwOBA) and Kirby (3.45 ERA, 0.286 xwOBA), though the Mariners sit 22-26 with a -3 run differential despite a +6 overall RS-RA gap suggesting better offensive support ahead.

Robinson Ortiz