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MLB Prop Bets: Seattle Mariners vs Athletics (April 20, 2026)

The Athletics (11-10) face the Seattle Mariners (9-13) at T-Mobile Park on Monday at 9:40pm (ET). Let's take a look at the MLB Prop Bets for the matchup. J.T. Ginn is the probable pitcher for the Athletics, while Emerson Hancock is the probable pitcher for the Mariners. The Mariners are favored to win at -163, while the Athletics are at +135. The total runs line is set at 8.0, with OVER at -115 and UNDER at -105.

  • The Athletics (-163) have an 11-10 Run Line record this season, while the Mariners (+135) hold a record of 10-12.
  • The Athletics have a 10-10-1 O/U record this season (meaning 10 games have gone over the total runs line, 10 have gone under and one has resulted in a push). The Mariners have a 10-12-0 O/U record.

Scoring Insights

  • The Athletics are averaging 4.1 runs per game this season (T18th in the league). Comparatively, the Mariners are averaging 3.9 (22nd).
  • In the field, the Athletics are allowing 4.9 runs per game this season (23rd in the league), while the Mariners are allowing an average of 3.7 runs (6th).

Let's take a look at how these teams perform in some other key statistical areas.

Batting Insights:

Batting Average

  • Looking at their batting averages this season, the Athletics are at .232 (ranking 19th in the Major leagues), while the Mariners are batting .214 (28th).

Home Runs

  • In terms of total home runs this season, the Mariners have hit 18 (20th in the Major Leagues). Meanwhile, the Athletics have managed 19 (T18th).

Runs Batted In

  • Finally, looking at their runs batted in, the Athletics have recorded 86 RBIs to rank T16th in the MLB this season. Comparatively, the Mariners have recorded 82 RBIs to rank T20th.

Pitching Insights:

Earned Run Average

  • The Mariners have one of the strongest earned run averages this season, sitting at 3.27 (4th in the Majors), while the Athletics are at the opposite end of the scale with an ERA of 4.71 (25th).

Strikeouts

  • Turning our attention to total strikeouts, the Athletics have recorded 171 this season, ranking 18th in the MLB. Meanwhile, the Mariners rank 11th for total strikeouts, recording 185.

Opponent Batting Average

  • Opponents are batting an average of .249 against the Mariners this season (24th in the Major Leagues). Comparatively, the Athletics' opponents are at .242 (20th).

First Innings Moneyline

  • Here are their first innings moneyline records in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Athletics 1-9-11 1-4-4 0-5-7 1-2-1 0-7-10 0-0-0 1-4-5
    Mariners 6-6-10 5-4-4 1-2-6 6-5-7 0-1-3 0-0-0 5-1-4

Lead After Three Innings

  • Here are their records after the first three innings in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Athletics 7-10-4 2-5-2 5-5-2 0-3-1 7-7-3 0-0-0 4-4-2
    Mariners 8-8-6 6-5-2 2-3-4 6-7-5 2-1-1 0-0-0 4-4-2

NRFI/YRFI

  • The NRFI is 11-10 in Athletics games this season. The Mariners have an 8-14 NRFI record.

Last Time They Met

The Mariners recorded an upset 11-4 victory over the Athletics at T-Mobile Park when these teams last met on August 24, 2025. Cal Raleigh was crushing the ball in that matchup, hitting 2 home runs and recording 4 RBIs.