MLB Prop Bets: Kansas City Royals vs Seattle Mariners (May 23, 2026)
The Seattle Mariners (25-27) face the Kansas City Royals (20-31) at Kauffman Stadium on Saturday at 4:10pm (ET). Let's take a look at the MLB Prop Bets for the matchup. George Kirby is the probable pitcher for the Mariners, while Stephen Kolek is the probable pitcher for the Royals. The Mariners are favored to win at -143, while the Royals are at +119. The total runs line is set at 8.5, with OVER at -112 and UNDER at -107.
- The Mariners (+119) have a 21-31 Run Line record this season, while the Royals (-143) hold a record of 21-30.
- The Mariners have a 23-27-2 O/U record this season (meaning 23 games have gone over the total runs line, 27 have gone under and two have resulted in a push). The Royals have a 22-27-2 O/U record.
Scoring Insights
- The Mariners are averaging 4.1 runs per game this season (23rd in the league). Comparatively, the Royals are averaging 3.8 (28th).
- In the field, the Mariners are allowing only 3.8 runs per game this season (6th in the league), while the Royals are allowing an average of 4.4 runs (15th).
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 Mariners are at .225 (ranking 29th in the Major leagues), while the Royals are batting .235 (20th).
Home Runs
- In terms of total home runs this season, the Royals have hit 48 (T19th in the Major Leagues). Meanwhile, the Mariners have managed 59 (T10th).
Runs Batted In
- Finally, looking at their runs batted in, the Mariners have recorded 207 RBIs to rank 19th in the MLB this season. Comparatively, the Royals have recorded 187 RBIs to rank 28th.
Pitching Insights:
Earned Run Average
- The Royals have an earned run average of 4.24 this season (20th in the Majors), while The Mariners have an ERA of 3.57 (6th).
Strikeouts
- Turning our attention to total strikeouts, the Mariners have recorded 453 this season, ranking 9th in the MLB. Meanwhile, the Royals rank 15th for total strikeouts, recording 427.
Opponent Batting Average
- Opponents are batting an average of .243 against the Royals this season (18th in the Major Leagues). Comparatively, the Mariners' opponents are at .248 (22nd).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 14-13-25 | 10-9-10 | 4-4-15 | 14-12-21 | 0-1-4 | 0-0-0 | 4-1-5 |
| Royals | 8-11-32 | 4-5-18 | 4-6-14 | 4-6-18 | 4-5-14 | 0-0-0 | 3-2-5 |
Lead After Three Innings
- Here are their records after the first three innings in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 21-17-14 | 13-10-6 | 8-7-8 | 18-16-13 | 3-1-1 | 0-0-0 | 4-2-4 |
| Royals | 15-24-12 | 9-11-7 | 6-13-5 | 7-15-6 | 8-9-6 | 0-0-0 | 2-5-3 |
NRFI/YRFI
The NRFI market is paying -115 and the YRFI is paying -115.
- The NRFI is 22-30 in Mariners games this season. The Royals have a 30-21 NRFI record.
Last Time They Met
The Mariners recorded a 2-0 victory over the Royals at Kauffman Stadium yesterday. Mitch Garver was unstoppable in that matchup, hitting a home run, a single and recording 2 RBIs. That result snapped the Royals' three-game winning streak against the Mariners.
