The Seattle Mariners host the Athletics on August 23, 2025. First pitch from T-Mobile Park is scheduled for 9:40 p.m. EDT; the game will be broadcast on NBCS-CA.
Find my MLB betting preview and Athletics vs Mariners prediction below, as well as probable pitchers, betting trends, injury reports and more.
My Athletics vs Mariners Prediction
- Athletics vs Mariners picks: Athletics ML
My Athletics vs Mariners best bet is on Athletics to win outright. Make sure to find the best odds by checking our live MLB odds page.
Athletics vs Mariners Odds
| Athletics Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+1.5 -145 | 8 -110o / -110u | +145 |
| Mariners Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-1.5 +120 | 8 -110o / -110u | -175 |
Athletics vs Mariners Projected Starting Pitchers
| LHP Jeffrey Springs (ATH) | Stat | RHP George Kirby (SEA) |
|---|---|---|
| 10-8 | W-L | 8-6 |
| 1.3 | fWAR (FanGraphs) | 1.8 |
| 4.24 / 4.15 | ERA /xERA | 4.22 / 3.69 |
| 4.72 / 4.63 | FIP / xFIP | 3.37 / 3.33 |
| 1.19 | WHIP | 1.18 |
| 12.0% | K-BB% | 19.2% |
| 31.8% | GB% | 45.4% |
| 100 | Stuff+ | 98 |
| 103 | Location+ | 113 |
Kenny Ducey’s Athletics vs Mariners Preview
Athletics Betting Preview
Jeffrey Springs has been a maddening pitcher to handicap, and he's done us no favors with his most recent starts. After shining in six one-run innings against the Washington Nationals to open the month, he proceeded to allow nine runs to the Rays and Angels, bringing his ERA for August up to 6.43.
The thing is, Springs' Expected Batting Average has come down to .246 this month after residing at .265 in July, and his .407 Expected Slugging — while still a mediocre mark — represents the lowest of his season.
Unfortunately, that's what you get pitching to fly balls in Sacramento, and perhaps the expected numbers are lying a bit given the novel nature of the Athletics' home park. Whatever the case, the lefty has been searching for his old strikeout stuff, and despite posting a 29.5% whiff rate this month he's struck out just 19.4% of the batters he's faced due to his lack of command.
The lefty has at least found a way to handle the Mariners this season, posting a 1.59 ERA across 17 innings with 20 strikeouts and four walks. Seattle has hit just .167 against him in those three games, and last year — when Springs was still in Tampa — the veteran held them to just a hit and two walks with nine strikeouts over five scoreless.
Seattle Mariners Betting Preview
George Kirby is the enigma of the Mariners' staff, pitching to an above-average 45.4% ground-ball rate which is far and away the highest mark of any starter they have. What that's meant is a higher xBA — which stands at a lousy .253 — but it's not as if he's avoiding trouble in the slugging department. Kirby's 8% barrel rate is merely average, and he's allowed a ton of hard-hit balls this season — and far more than he's ever surrendered in his career.
Still, his home ERA stands at 3.38 — far superior to his 5.08 road ERA — and he's allowed just four homers in eight starts made at T-Mobile Park. Kirby is more ground-ball happy than his teammates, sure, but he's still allowed a more or less average distribution of fly balls and line drives which has forced his home park's hand time and time again.
The righty has begun to regress slightly as the months have gone on, posting a terrible .272 xBA this month which has caused many Mariners fans to claim he's dealing with an injury. It's hard to buy that with his whiff rate way up since the start of July, however, and my best diagnosis would simply be that he's focusing too much on taking the bat out of his opponent's hands with more walks creeping in over that period in time.
His last outing was the worst of his season by far, where he allowed seven runs on 12 hits and three walks to the Mets, but the bright side is he's allowed just one homer in his last four starts. He'll need to limit the walks and bring that xBA down to navigate this one.
Athletics vs Mariners Prediction, Betting Analysis
The Mariners have looked hopeless against Springs in the last couple of years, and now that the lefty is moving away from his homerrific park in Sacramento, I'd expect him to keep racking up outs on fly balls as he continues to repair his strikeout numbers.
Seattle, which has had issues making contact against Springs for years, is going through one of its worst stretches of the season in that area, with a 27.3% strikeout rate in the last two weeks which stands as the second-highest in baseball. On top of that, it's walked in just 8% of plate appearances and has solely relied on power with a .192 ISO.
With the Mariners' power sapped here, and a dangerous Athletics team which can take walks and do it all at the plate, I have to side with the visitors here. Something is not right with Kirby, and it's not as if the Athletics will swing their way out of this game with a friendly 22.5% punchout rate over the last 14 days. They have the better offense, and they've got the better pitcher for this matchup.
Pick: Athletics ML (+145) | Play to +137
Moneyline
As mentioned, I like Athletics to win outright tonight.
Run Line (Spread)
I will not be betting on the Run Line.
Over/Under
I'm also staying away from game totals.
