A's vs Mariners Picks and Predictions: Chris Flexen Flexes on Oakland

Oakland and Seattle begin a pivotal three-game set at T-Mobile Park as both teams fight for a wild-card spot in the AL. The M's have the advantage in the series opener with righty Chris Flexen on the mound. Find out more in our A's vs. Mariners picks.

Last Updated: Sep 27, 2021 3:25 PM ET Read Time: 4 min
Chris Flexen Seattle Mariners MLB
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The American League wild-card race is coming down to the wire and while the Oakland Athletics and Seattle Mariners are currently on the outside of the playoff picture looking in, they are still alive as they begin a pivotal three-game set tonight at T-Mobile Park.

The A’s are three games back of the last wild-card spot while the Mariners are just two games behind, so neither team can afford any more setbacks. Who has the edge for the series opener between the AL West rivals?

Find out with our free MLB betting picks and predictions for Athletics vs. Mariners on Monday, September 27.

A's vs Mariners game info

Location: T-Mobile Park, Seattle, WA
Date: Monday, September 27, 2021
Time: 10:10 p.m. ET

A's vs Mariners odds

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A's vs Mariners betting preview

Starting pitchers

Cole Irvin (10-14, 3.99 ERA): After pitching well for most of the season it feels like Irvin has hit a bit of a wall recently. The lefty has pitched to a 5.77 ERA while allowing opponents to hit a robust .335 over his last eight starts.

Chris Flexen (13-6, 3.56 ERA): The former KBO star has earned his MLB contract and has been fantastic down the stretch for the Mariners. Flexen owns a 3.12 ERA and a 1.22 WHIP over his last 10 starts, with the M’s winning seven of those 10 games.


Be sure to monitor the gametime conditions with our MLB weather info.

Key injuries

A's: Jed Lowrie 2B (Out), Mitch Moreland DH (Out).
Mariners: New key injuries to report.
Find our latest MLB injury reports.

Betting trend to know

The Mariners have won nine straight meetings against the A's. Find more MLB betting trends for A's vs. Mariners.

Moneyline pick

The A’s saved their season thanks to a three-game sweep of the Houston Astros over the weekend but now they must get past their kryptonite, the Mariners. The A’s have dropped nine straight games against the M’s this season and it won’t be easy if they want to end that horrible slide.

That’s because they’ll be facing Flexen, one of the Mariners' best starters. The right-hander has quietly had an outstanding return to the big leagues and his numbers at home have been great. Flexen is pitching to a 3.09 ERA and a 1.15 WHIP at T-Mobile Park this season. 

The righty is also coming off an impressive start against the A’s his last time out and has allowed just four runs in his last 19 innings of work against Oakland.

As noted, Flexen’s counterpart is in a bit of a slump. On top of that, Seattle has had Irvin's number this season. Irvin has a 7.56 ERA in four starts versus the M's, who are hitting an impressive .377 against him.

The Mariners have the better starter on the hill in this one, have the slightly better bullpen, and have seen the ball well out of Irvin’s hand this season. We’re betting they make it 10 in a row against the A’s. 

PREDICTION: Mariners (-115)

Over/Under pick

While the Mariners' streak against the A’s is an impressive one, the games haven’t been as one-sided as you may think.

The biggest margin of victory over this nine-game streak for the M’s has been four runs and these games have been decided by two runs or fewer six times. As a result of these tight contests, the Under has been a profitable 7-2 over that stretch and is 11-5 overall in this matchup this season.

Flexen is primed for success in this matchup with the A’s and although Irvin has struggled, he still has a solid 3.99 ERA and a 1.31 WHIP on the year. And even though the Mariners have had his number, they still rank 29th in batting average and 27th in OPS when facing lefties this season.

The intensity for this one should be jacked to 11. Expect another tight contest and the Under trend to continue.

PREDICTION: Under 8.5 (-110)

A's vs Mariners betting card

  • Mariners (-115)
  • Under 8.5 (-110)

Picks made on 9/27/2021 at 2:55 p.m. ET

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