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MLB Prop Bets: Seattle Mariners vs Athletics (September 5, 2026)

The Athletics (56-86) face the Seattle Mariners (66-76) at T-Mobile Park on Saturday at 9:40pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Jeffrey Springs is the probable pitcher for the Athletics, while George Kirby is the probable pitcher for the Mariners. The Mariners are favored to win at -257, while the Athletics are at +207. The total runs line is set at 8.0, with OVER at -105 and UNDER at -115.

  • The Athletics (+104) have a 66-76 Run Line record this season, while the Mariners (-126) hold a record of 56-86.
  • The Athletics have a 72-65-5 O/U record this season (meaning 72 games have gone over the total runs line, 65 have gone under and five have resulted in a push). The Mariners have a 73-61-8 O/U record.

Scoring Insights

  • The Athletics are averaging 4.4 runs per game this season (18th in the league). Comparatively, the Mariners are averaging only 4.0 (30th).
  • In the field, the Athletics are allowing a whopping 5.7 runs per game this season (30th in the league), while the Mariners are allowing an average of 4.5 runs (17th).

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 .248 (ranking 11th in the Major leagues), while the Mariners are batting .230 (29th).

Home Runs

  • In terms of total home runs this season, the Mariners have hit 163 (T14th in the Major Leagues). Meanwhile, the Athletics have managed 172 (T9th).

Runs Batted In

  • Finally, looking at their runs batted in, the Athletics have recorded 599 RBIs to rank 18th in the MLB this season. Comparatively, the Mariners have recorded 544 RBIs to rank 30th.

Pitching Insights:

Earned Run Average

  • The Mariners have an earned run average of 4.22 this season (19th in the Majors), while The Athletics have an ERA of 5.45 (30th).

Strikeouts

  • Turning our attention to total strikeouts, the Athletics have recorded 1198 this season, ranking T12th in the MLB. Meanwhile, the Mariners rank T12th for total strikeouts, recording 1198.

Opponent Batting Average

  • Opponents are batting an average of .252 against the Mariners this season (23rd in the Major Leagues). Comparatively, the Athletics' opponents are at .269 (29th).

First Innings Moneyline

  • Here are their first innings moneyline records in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Athletics 29-44-69 17-21-31 12-23-38 8-10-17 21-34-52 0-0-0 1-4-5
    Mariners 34-37-71 21-16-33 13-21-38 27-25-53 7-12-18 0-0-0 1-3-6

Lead After Three Innings

  • Here are their records after the first three innings in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Athletics 50-60-32 28-30-11 22-30-21 11-16-8 39-44-24 0-0-0 3-6-1
    Mariners 58-53-31 32-22-16 26-31-15 41-37-27 17-16-4 0-0-0 4-4-2

NRFI/YRFI

  • The NRFI is 65-77 in Athletics games this season. The Mariners have a 64-78 NRFI record.

Last Time They Met

The Athletics recorded an upset 7-6 victory over the Mariners at T-Mobile Park yesterday. Cal Raleigh was unstoppable in that matchup, hitting a home run, a double and recording 2 RBIs.