Mariners vs Athletics Prediction, Odds, Moneyline, Spread & Over/Under for April 20

Odds updated as of 6:12 a.m.

The Seattle Mariners are among the MLB teams in action on Monday, up against the Athletics.

Before checking out the MLB betting lines on FanDuel Sportsbook, we've got you covered, in terms of the most important info regarding this game.

Mariners vs Athletics Game Info

• Seattle Mariners (10-13) vs. Athletics (11-11)
• Date: Monday, April 20, 2026
• Time: 9:40 p.m. ET
• Venue: T-Mobile Park -- Seattle, Washington
• Coverage: Mariners.TV and NBCS-CA

Mariners vs Athletics Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-158) | OAK: (+134)
• Spread: SEA: -1.5 (+136) | OAK: +1.5 (-164)
• Total: 8 -- Over: (-115) | Under: (-105)

Mariners vs Athletics Probable Starting Pitchers

Probable Pitchers: Emerson Hancock (Mariners) - 2-1, 2.28 ERA vs J.T. Ginn (Athletics) - 0-0, 3.31 ERA

The Mariners will give the ball to Emerson Hancock (2-1, 2.28 ERA), who is eyeing win No. 3 on the season, and the Athletics will counter with J.T. Ginn. Hancock's team is 2-2-0 against the spread this season in his starts. Hancock's team has been victorious in 66.7% of the games he's started as the moneyline favorite with a record of 2-1. Ginn has started two games with set spreads, and the Athletics covered in both chances. The Athletics were the moneyline underdog for one Ginn start this season -- they won.

Mariners vs Athletics Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (55.1%)

Mariners vs Athletics Moneyline

• The Mariners vs Athletics moneyline has the Mariners as a -158 favorite, while the Athletics are a +134 underdog on the road.

Mariners vs Athletics Spread

• The Mariners are 1.5-run favorites on the runline against the Athletics. The Mariners are +136 to cover, while the Athletics are -164 to cover.

Mariners vs Athletics Over/Under

• A total of 8 runs has been set for the Mariners-Athletics contest on April 20, with the over available at -115 and the under at -105.

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Mariners vs Athletics Betting Trends

• The Mariners have won in nine, or 47.4%, of the 19 contests they have been named as odds-on favorites in this year.
• This year, the Mariners have won four of seven games when listed as at least -158 or better on the moneyline.
• The Mariners and their opponents have hit the over in 10 of their 23 games with a total this season.
• The Mariners have an against the spread mark of 9-14-0 in 23 games with a line this season.
• The Athletics have won eight of the 16 games they were listed as the moneyline underdog this season (50%).
• When they have played as a moneyline underdog with odds of +134 or longer, the Athletics have gone 4-4 (50%).
• The Athletics have combined with their opponents to hit the over on the total 11 times this season for an 11-11-0 record against the over/under.
• The Athletics have covered 54.5% of their games this season, going 12-10-0 ATS.

Mariners Player Leaders

• Randy Arozarena has an OPS of .829, fueled by an OBP of .402 and a team-best slugging percentage of .427 this season. He has a .293 batting average.
• Among all qualified batters, he ranks 34th in batting average, his on-base percentage ranks 17th, and he is 73rd in slugging.
• Arozarena will look for his third straight game with a hit in this contest. During his last five outings he is hitting .316 with two doubles, a home run, two walks and two RBIs.
• Luke Raley leads Seattle with 21 hits. He is batting .313 this season and has 10 extra-base hits. He's also slugging .627 with an on-base percentage of .370.
• Among all qualified hitters, he ranks 14th in batting average, 42nd in on-base percentage and fifth in slugging percentage.
• Cole Young has 19 hits this season and has a slash line of .244/.344/.372.
• Young has logged a hit or more in four games in a row. In his last five games he is hitting .294 with four walks and two RBIs.
• Brendan Donovan leads Seattle in OBP (.437) this season, fueled by 17 hits.

Athletics Player Leaders

• Shea Langeliers has racked up a slugging percentage of .571 and has 26 hits, both team-high numbers for the Athletics. He's batting .310 and with an on-base percentage of .376.
• Including all qualifying hitters, he is 19th in batting average, while his on-base percentage ranks 35th and he is 12th in slugging.
• Tyler Soderstrom is hitting .202 with six doubles, a triple, two home runs and 11 walks. He's slugging .369 with an on-base percentage of .295.
• Including all qualified players, he is 151st in batting average, 138th in on-base percentage and 110th in slugging percentage.
• Jacob Wilson is batting .253 with three doubles, two home runs and a walk.
• Nick Kurtz's .421 on-base percentage paces his team.

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