- Matchup: Seattle Mariners vs Arizona Diamondbacks
- Date: Friday, May 29, 2026
- Venue: T-Mobile Park, Seattle, WA
- Broadcast: MLB.TV
- Betting Odds: Arizona (+132) Seattle (-160)
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This Friday, the Seattle Mariners (28-29) will face off against the Arizona Diamondbacks (31-24) at T-Mobile Park. The odds favor the Mariners at -160 while the Diamondbacks come in at +132. The total runs for this matchup are projected at 8.5. Zac Gallen is expected to start on the mound for Arizona, while George Kirby will take the ball for Seattle.
The Arizona Diamondbacks are averaging 4.6 runs per game, ranking them 9th in Major League Baseball. They have scored a total of 255 runs this season with an on-base percentage (OBP) of .314. The team has 103 doubles and 48 home runs, totaling 246 RBIs and 453 hits, yielding a batting average of .248. Additionally, Arizona has a slugging percentage of .402, having struck out 416 times and drawn 169 walks.
For the season, the Diamondbacks boast a team earned run average of 4.02, positioning them 16th in the league, with a total of 392 strikeouts. Arizona’s pitchers have allowed 58 home runs and conceded 241 runs overall (13th in the league). They have issued 162 walks, with a collective Fielding Independent Pitching (FIP) of 4.12. The team has given up 439 hits (averaging 8.1 per 9 innings) and 217 earned runs, holding a K/BB ratio of 2.42 and a WHIP of 1.24.
Diamondbacks’ relievers have been called into action with runners on base 51 times and have appeared in 69 high-leverage situations this season. They have recorded 39 holds, ranking 6th in the league, and a save percentage of 64.0%, having recorded 16 saves out of 25 attempts. This season, 180 relief pitchers have taken the mound for Arizona.
Defensively, the Diamondbacks have converted 72.0% of balls in play into outs over 4,374 innings, ranking them 4th in the MLB. They’ve made 1,458 putouts, 470 assists, and committed 22 errors, achieving a fielding percentage of .989, placing them 7th in the league, and turning 36 double plays.
Starting pitcher Zac Gallen has pitched 1,061 innings, accumulating 1,100 strikeouts in his MLB career. Gallen holds a career record of 69-56, with a FIP of 3.59 after facing 4,382 hitters. His ERA stands at 3.65 (allowing 430 earned runs), and he has a WHIP of 1.173. He has surrendered 904 hits, averaging 7.7 hits per nine innings with 341 walks.
The Seattle Mariners, meanwhile, have a slugging percentage of .383, averaging 4.21 runs per game (18th in the league). They’ve hit 79 doubles, recorded 240 runs, and walked 208 times. Seattle has banged out 66 home runs, resulting in 234 RBIs. They have struck out 504 times (ranked 7th in the MLB) and have tallied 435 total hits. Their team OBP is .317, with a batting average of .230.
On the mound, the Mariners have a WHIP of 1.217 and a FIP of 3.59 for the season. Their strikeout-to-walk ratio is an impressive 8.60 (485 strikeouts to 147 walks). However, they rank 25th in total hits allowed with 469, conceding 54 home runs and allowing 3.84 runs per nine innings (5th in baseball). Their team ERA stands at 3.54, having allowed 216 runs (199 earned runs).
The Mariners’ relief pitchers have an inherited score percentage of 16.1% from 56 inherited runners. They’ve stepped into 67 high-leverage situations and have preserved a total of 30 holds while experiencing 8 blown saves. They possess a save percentage of 63.6% and have utilized 173 relief pitchers throughout the current season.
Seattle’s defense has converted 69.1% of their chances, ranking 23rd in baseball, while achieving 52 double plays and maintaining a fielding rate of .988 (8th in the sport). They’ve tallied 471 assists, 24 errors, and 1,519 putouts so far this season.
Throughout his career, George Kirby has allowed 683 hits while securing 676 strikeouts across 705 innings pitched. He owns a WHIP of 1.123 with a FIP of 3.5, allowing 281 earned runs. His K/BB ratio stands at 6.20 against 2,879 batters faced, and Kirby holds a career record of 50-38 with a 3.59 ERA, averaging 8.7 hits allowed per nine innings.
Who will emerge victorious in tonight’s MLB contest against the spread or moneyline?
Prediction: Opt for Seattle (-160)
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