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MLB Prop Bets: Seattle Mariners vs Kansas City Royals (May 1, 2026)

The Kansas City Royals (12-19) face the Seattle Mariners (16-16) at T-Mobile Park on Friday at 9:45pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Cole Ragans is the probable pitcher for the Royals, while Bryan Woo is the probable pitcher for the Mariners. The Mariners are favored to win at -156, while the Royals are at +129. The total runs line is set at 7.0, with OVER at -115 and UNDER at -105.

  • The Royals (-171) have a 14-17 Run Line record this season, while the Mariners (+141) hold a record of 14-18.
  • The Royals have a 13-16-2 O/U record this season (meaning 13 games have gone over the total runs line, 16 have gone under and two have resulted in a push). The Mariners have a 15-16-1 O/U record.

Scoring Insights

  • The Royals are averaging 4.1 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 4.0 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 Royals are at .240 (ranking 16th in the Major leagues), while the Mariners are batting .234 (22nd).

Home Runs

  • In terms of total home runs this season, the Mariners have hit 34 (T13th in the Major Leagues). Meanwhile, the Royals have managed 31 (T18th).

Runs Batted In

  • Finally, looking at their runs batted in, the Royals have recorded 119 RBIs to rank T22nd in the MLB this season. Comparatively, the Mariners have recorded 131 RBIs to rank 17th.

Pitching Insights:

Earned Run Average

  • The Mariners have an earned run average of 3.67 this season (5th in the Majors), while The Royals have an ERA of 4.54 (24th).

Strikeouts

  • Turning our attention to total strikeouts, the Royals have recorded 264 this season, ranking 14th in the MLB. Meanwhile, the Mariners rank 18th for total strikeouts, recording 258.

Opponent Batting Average

  • Opponents are batting an average of .261 against the Mariners this season (24th in the Major Leagues). Comparatively, the Royals' opponents are at .247 (21st).

First Innings Moneyline

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

Lead After Three Innings

  • Here are their records after the first three innings in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Royals 9-15-7 6-6-4 3-9-3 4-8-3 5-7-4 0-0-0 2-6-2
    Mariners 12-12-8 8-6-3 4-6-5 10-11-7 2-1-1 0-0-0 4-4-2

NRFI/YRFI

  • The NRFI is 21-10 in Royals games this season. The Mariners have a 13-19 NRFI record.

Last Time They Met

The Mariners recorded a 2-0 victory over the Royals at Kauffman Stadium when these teams last met on September 18, 2025. Josh Naylor led the way to that victory, hitting a home run.