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MLB Prop Bets: Seattle Mariners vs Kansas City Royals (May 2, 2026)

The Kansas City Royals (13-19) face the Seattle Mariners (16-17) at T-Mobile Park on Saturday at 9:40pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Seth Lugo is the probable pitcher for the Royals, while Emerson Hancock is the probable pitcher for the Mariners. The Mariners are favored to win at -149, while the Royals are at +123. The total runs line is set at 7.5, with OVER at -105 and UNDER at -115.

  • The Royals (-181) have a 15-17 Run Line record this season, while the Mariners (+149) hold a record of 14-19.
  • The Royals have a 14-16-2 O/U record this season (meaning 14 games have gone over the total runs line, 16 have gone under and two have resulted in a push). The Mariners have a 16-16-1 O/U record.

Scoring Insights

  • The Royals are averaging 4.2 runs per game this season (23rd in the league). Comparatively, the Mariners are averaging 4.2 (21st).
  • In the field, the Royals are allowing 4.8 runs per game this season (22nd in the league), while the Mariners are allowing an average of 4.1 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 Royals are at .241 (ranking 16th in the Major leagues), while the Mariners are batting .233 (23rd).

Home Runs

  • In terms of total home runs this season, the Mariners have hit 38 (T11th in the Major Leagues). Meanwhile, the Royals have managed 33 (T16th).

Runs Batted In

  • Finally, looking at their runs batted in, the Royals have recorded 126 RBIs to rank T22nd in the MLB this season. Comparatively, the Mariners have recorded 137 RBIs to rank 16th.

Pitching Insights:

Earned Run Average

  • The Mariners have an earned run average of 3.77 this season (7th in the Majors), while The Royals have an ERA of 4.59 (25th).

Strikeouts

  • Turning our attention to total strikeouts, the Royals have recorded 277 this season, ranking 12th in the MLB. Meanwhile, the Mariners rank T17th for total strikeouts, recording 265.

Opponent Batting Average

  • Opponents are batting an average of .261 against the Mariners this season (25th in the Major Leagues). Comparatively, the Royals' opponents are at .246 (18th).

First Innings Moneyline

  • Here are their first innings moneyline records in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Royals 3-7-22 1-4-11 2-3-11 1-4-10 2-3-12 0-0-0 2-2-6
    Mariners 8-9-16 7-7-4 1-2-12 8-8-13 0-1-3 0-0-0 1-3-6

Lead After Three Innings

The Royals are +110 to lead after three innings, while the Mariners are -140.

  • Here are their records after the first three innings in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Royals 10-15-7 6-6-4 4-9-3 4-8-3 6-7-4 0-0-0 3-5-2
    Mariners 12-13-8 8-7-3 4-6-5 10-12-7 2-1-1 0-0-0 3-5-2

NRFI/YRFI

The NRFI market is paying -145 and the YRFI is paying +110.

  • The NRFI is 21-11 in Royals games this season. The Mariners have a 13-20 NRFI record.

Last Time They Met

The Royals recorded a 7-6 victory over the Mariners at T-Mobile Park yesterday. Julio Rodriguez was crushing the ball in that matchup, hitting 2 home runs and recording 4 RBIs.