First Pitch: 7:10 PM PT / 10:10 PM ET
Television: ROOT Sports Northwest, Bally Sports Arizona, MLB.TV
Series: Game 1 of 3 — Interleague‑style NL West vs. AL West matchup
The Diamondbacks enter Seattle riding strong pitching and improved offensive consistency, while the Mariners continue to hover just below .500, struggling to find rhythm at the plate despite elite starting pitching. This matchup features two of MLB’s premier right‑handers: Zac Gallen, Arizona’s ace, and George Kirby, Seattle’s command‑driven star. This is a true pitcher’s duel, with both teams relying heavily on their rotations to set the tone.
WEATHER & BALLPARK CONDITIONS
(T‑Mobile Park has a retractable roof — weather influences roof decision and crowd, not gameplay.)
Temperature Outside: 63–66°F
Sky: Overcast
Humidity: 70–75%
Wind: 8–12 mph blowing in from left
Chance of Rain: 40%
Roof: Likely closed
Park Factor: Pitcher‑friendly, suppresses HRs and favors line‑drive hitters
Conditions indoors favor pitchers and contact hitters, reducing long‑ball potential.
INJURY REPORT
Arizona Diamondbacks
Corbin Carroll — ACTIVE
Ketel Marte — ACTIVE
Christian Walker — PROBABLE (ankle soreness)
Jordan Lawlar — OUT (thumb surgery)
Paul Sewald — ACTIVE
Seattle Mariners
Julio Rodríguez — ACTIVE
Cal Raleigh — PROBABLE (knee soreness)
Ty France — OUT (wrist fracture)
Matt Brash — OUT (elbow)
Andrés Muñoz — ACTIVE
TEAM RECORDS & RECENT FORM
Arizona Diamondbacks (31–24)
Last 10: 6–4
Road Record: 15–13
Run Differential: +27
Trend: Pitching strong; offense improving; bullpen stabilizing
Arizona has been one of the NL’s most consistent teams in May.
Seattle Mariners (28–29)
Last 10: 4–6
Home Record: 16–13
Run Differential: –11
Trend: Elite pitching; offense inconsistent; bullpen strong late
Seattle continues to rely heavily on its rotation to stay competitive.
SERIES HISTORY
2025 Season Series: Diamondbacks won 3–1
Last 10 Meetings: Diamondbacks lead 6–4
At T‑Mobile Park: Mariners have won 3 of last 5
Average Runs/Game (last 5 matchups): 7.2
These teams tend to play tight, low‑scoring games, especially in Seattle.
STARTING PITCHING MATCHUP
ARI — ZAC GALLEN (RHP)
2026 Stats: 3.18 ERA | 1.12 WHIP | 9.5 K/9
Last 3 Starts: 2.67 ERA, 1.05 WHIP
Pitch Mix: Four‑seam, curveball, changeup, cutter
Strengths: Elite command; excellent vs. right‑handed hitters; durable
Weakness: Occasional HR issues vs. lefties
Matchup Outlook: Gallen’s changeup and cutter combination plays extremely well against Seattle’s swing‑and‑miss tendencies.
SEA — GEORGE KIRBY (RHP)
2026 Stats: 3.41 ERA | 1.09 WHIP | 8.7 K/9
Last 3 Starts: 3.12 ERA, 1.04 WHIP
Pitch Mix: Four‑seam, sinker, slider, splitter
Strengths: Best command in MLB; elite vs. right‑handed hitters
Weakness: Occasionally too hittable in the zone; vulnerable to early‑count ambush swings
Matchup Outlook: Arizona’s aggressive top‑of‑order hitters (Carroll, Marte) must attack early before Kirby gets ahead.
KEY PLAYER MATCHUPS
Julio Rodríguez (SEA) vs. Zac Gallen
Julio hits high‑velocity fastballs well
Gallen’s curveball can neutralize him
Edge: Gallen (slight)
Corbin Carroll (ARI) vs. George Kirby
Carroll excels vs. command‑first pitchers
Kirby rarely walks hitters
Edge: Even
Christian Walker (ARI) vs. SEA Bullpen
Walker crushes late‑inning fastballs
Mariners bullpen is elite but vulnerable to right‑handed power
Edge: Walker
Cal Raleigh (SEA) vs. ARI Pitching
Raleigh’s power plays well vs. changeup‑heavy pitchers
Gallen rarely gives up HRs in pitcher‑friendly parks
Edge: Gallen
BETTING TRENDS
Arizona Diamondbacks
6–3 in last 9
5–2 in last 7 road games
Under is 5–2 in last 7
Seattle Mariners
3–5 in last 8
4–1 in last 5 home games
Under is 6–3 in last 9
Head‑to‑Head
Diamondbacks 6–4 last 10
Unders hit in 4 of last 5
Game Odds
Arizona Diamondbacks 7
Seattle Mariners ` – 135
Odds Courtesy of Sports Odds Direct as of Thursday, May 28, 2026
