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MLB Prop Bets: Seattle Mariners vs Minnesota Twins (July 31, 2026)

The Minnesota Twins (55-55) face the Seattle Mariners (53-57) at T-Mobile Park on Friday at 10:10pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Zebby Matthews is the probable pitcher for the Twins, while Bryce Miller is the probable pitcher for the Mariners. The Mariners are favored to win at -193, while the Twins are at +158. The total runs line is set at 8.0, with OVER at -105 and UNDER at -115.

  • The Twins (-136) have a 58-52 Run Line record this season, while the Mariners (+113) hold a record of 45-65.
  • The Twins have a 58-46-6 O/U record this season (meaning 58 games have gone over the total runs line, 46 have gone under and six have resulted in a push). The Mariners have a 54-50-6 O/U record.

Scoring Insights

  • The Twins are averaging 4.7 runs per game this season (9th in the league). Comparatively, the Mariners are averaging only 4.0 (28th).
  • In the field, the Twins are allowing a whopping 5.0 runs per game this season (26th in the league), while the Mariners are allowing an average of 4.0 runs (5th).

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 Twins are at .245 (ranking 14th 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 129 (T13th in the Major Leagues). Meanwhile, the Twins have managed 127 (T15th).

Runs Batted In

  • Finally, looking at their runs batted in, the Twins have recorded 492 RBIs to rank 9th in the MLB this season. Comparatively, the Mariners have recorded 424 RBIs to rank 27th.

Pitching Insights:

Earned Run Average

  • The Mariners have an earned run average of 3.74 this season (9th in the Majors), while The Twins have an ERA of 4.62 (25th).

Strikeouts

  • Turning our attention to total strikeouts, the Twins have recorded 906 this season, ranking 19th in the MLB. Meanwhile, the Mariners rank 11th for total strikeouts, recording 937.

Opponent Batting Average

  • Opponents are batting an average of .241 against the Mariners this season (15th in the Major Leagues). Comparatively, the Twins' opponents are at .252 (22nd).

First Innings Moneyline

  • Here are their first innings moneyline records in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Twins 27-26-57 13-10-34 14-16-23 8-7-18 19-19-39 0-0-0 2-1-7
    Mariners 22-29-59 13-13-27 9-16-32 21-22-47 1-7-12 0-0-0 0-8-2

Lead After Three Innings

  • Here are their records after the first three innings in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Twins 43-41-26 22-18-17 21-23-9 13-10-10 30-31-16 0-0-0 1-4-5
    Mariners 41-42-27 23-17-13 18-25-14 33-33-24 8-9-3 0-0-0 1-6-3

NRFI/YRFI

  • The NRFI is 49-61 in Twins games this season. The Mariners have a 54-56 NRFI record.

Last Time They Met

The Mariners recorded a 5-3 victory over the Twins at Target Field when these teams last met on April 29. J.P. Crawford was unstoppable in that matchup, hitting a home run, a single and recording an RBI.