Seattle Mariners Lead Kansas City Royals 6-1 in Head-to-Head Matchups (2023)

MLB3-4-0 ATS (42.86%)Data through 2023-08-27

Royals vs Mariners Betting Record — 2023

Against the Spread
3-4-0
Win %
42.86%
ROI
-13.85%
Units
-1.0
Moneyline
1-6-0
Win %
14.29%
ROI
-68%
Units
-4.8
Over Rate
6-1-0
Win %
85.71%
ROI
+67.27%
Units
+4.7

From the Other Side — Mariners vs Royals

Against the Spread
4-3-0
Win %
57.14%
ROI
+11.2%
Units
+0.8
Moneyline
6-1-0
Win %
85.71%
ROI
+27.38%
Units
+1.9
Over Rate
6-1-0
Win %
85.71%
ROI
+67.27%
Units
+4.7

Venue Splits

Royals Home
2-2-0 ATS
50% • -5.23%
1-3-0 ML (25%)
Mariners Home
2-1-0 ATS
66.67% • +31.33%
3-0-0 ML (100%)

Scoring Averages

Royals
4.7
PPG
7.6
allowed
Total
12.3
Avg
7
games
Mariners
7.6
PPG
4.7
allowed

Recent Matchups (2023)

DateScoreATSMLO/U
08/27L 3-2LU
08/26L 15-2LO
08/25L 7-5LO
08/17L 4-6LO
08/16L 5-6LO
08/15L 8-10LO
08/14W 7-6WO

Frequently Asked Questions

What is the Kansas City Royals vs Seattle Mariners all-time record?
The Kansas City Royals are 1-6 against the Seattle Mariners in 2023 in head-to-head matchups.
What is the Kansas City Royals ATS record vs the Seattle Mariners?
The Kansas City Royals are 3-4-0 against the spread vs the Seattle Mariners in 2023 on DraftKings, with -13.85% ROI.
Do Kansas City Royals vs Seattle Mariners games go over or under?
Kansas City Royals vs Seattle Mariners games average 12.3 total points in 2023. The Over has hit 85.71% of the time.

More Royals Matchups

Head-to-head betting record for Kansas City Royals vs Seattle Mariners in the 2023 season on LineTerminal. The Royals are 1-6 straight up against the Mariners and 3-4-0 against the spread (42.86% cover rate, -13.85% ROI) on DraftKings. Data sourced from DraftKings closing lines. Updated daily after games are graded. Past performance does not guarantee future results.

LineTerminal

AI-powered betting intelligence for NBA, NHL, MLB, and NCAAB.

LineTerminal provides sports data and analytics for informational and entertainment purposes only. LineTerminal does not accept, place, or facilitate bets or wagers of any kind. Odds data is sourced from third-party providers and may not reflect exact lines at every sportsbook. Past performance does not guarantee future results. Sports betting involves risk — never wager more than you can afford to lose.

If you or someone you know has a gambling problem, call 1-800-MY-RESET (National Problem Gambling Helpline) or visit ncpgambling.org. Must be 21+ in most jurisdictions. Please gamble responsibly.

© 2026 LineTerminal. All rights reserved.