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

Odds updated as of 9:11 p.m.

The Monday slate in MLB includes a matchup between the Seattle Mariners and the Athletics.

We've got you covered, in terms of the most important info regarding this game before you take a look at the MLB odds and spreads on FanDuel Sportsbook.

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: (-142) | OAK: (+120)
• Spread: SEA: -1.5 (+140) | OAK: +1.5 (-170)
• 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 probable starters are Emerson Hancock (2-1) for the Mariners and J.T. Ginn for the Athletics. Hancock and his team have a record of 2-2-0 against the spread when he starts. When Hancock starts a game and his team is the favorite on the moneyline, they have a record of 2-1. Ginn has started two games with set spreads, and the Athletics covered in both chances. The Athletics were named 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 (55.2%)

Mariners vs Athletics Moneyline

• The Mariners vs Athletics moneyline has the Mariners as a -142 favorite, while the Athletics are a +120 underdog on the road.

Mariners vs Athletics Spread

• The Mariners are 1.5-run favorites on the runline against the Athletics. The Mariners are +140 to cover, while the Athletics are -170 to cover.

Mariners vs Athletics Over/Under

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

Bet on Seattle Mariners vs. Athletics on FanDuel today!

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 season, the Mariners have come away with a win six times in 10 chances when named as a favorite of at least -142 or shorter 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 posted a record of 9-14-0 against the spread this season.
• The Athletics are 8-8 in games they were listed as the moneyline underdog (winning 50% of those games).
• The Athletics have gone 5-5 when they have played as a moneyline underdog with odds of +120 or longer (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 a 12-10-0 record ATS this season.

Mariners Player Leaders

• Randy Arozarena leads Seattle in slugging percentage (.427) thanks to seven extra-base hits. He has a .293 batting average and an on-base percentage of .402.
• Among qualified hitters in the majors, he ranks 33rd in batting average, 17th in on-base percentage, and 72nd in slugging.
• Arozarena will look for his third straight game with a hit in this contest. During his last five outings he is batting .316 with two doubles, a home run, two walks and two RBIs.
• Luke Raley has 21 hits, which ranks first among Seattle batters this season. He's batting .313 with 10 extra-base hits. He's also slugging .627 with an on-base percentage of .370.
• His batting average is 15th among qualified players, his on-base percentage 42nd, and his slugging percentage fifth.
• Cole Young has 19 hits this season and has a slash line of .244/.344/.372.
• Young enters this game with four games in a row with at least one hit. In his last five games he is hitting .294 with four walks and two RBIs.
• Dominic Canzone has two home runs, nine RBI and a batting average of .255 this season.
• Canzone brings a two-game hitting streak into this matchup. In his last five games he is hitting .385 with two doubles, a walk and five RBIs.

Athletics Player Leaders

• Shea Langeliers has a slugging percentage of .571 and has 26 hits, both team-best marks for the Athletics. He's batting .310 and with an on-base percentage of .376.
• Including all qualified hitters in the majors, he ranks 18th in batting average, 34th in on-base percentage and 11th in slugging percentage.
• 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.
• He is currently 150th in batting average, 137th in on-base percentage and 110th in slugging percentage among all qualifying hitters.
• Jacob Wilson is batting .253 with three doubles, two home runs and a walk.
• Nick Kurtz has a .421 on-base percentage to pace his team.

Sign up for FanDuel Sportsbook and FanDuel Daily Fantasy today!