MLB Prop Bets: Seattle Mariners vs Cincinnati Reds (July 21, 2026)
The Cincinnati Reds (45-54) face the Seattle Mariners (51-50) at T-Mobile Park on Tuesday at 9:40pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Chase Burns is the probable pitcher for the Reds, while Luis Castillo is the probable pitcher for the Mariners. The Mariners are favored to win at -114, while the Reds are at -106. The total runs line is set at 7.5, with OVER at -108 and UNDER at -112.
- The Reds (+160) have a 53-46 Run Line record this season, while the Mariners (-196) hold a record of 43-58.
- The Reds have a 56-43-0 O/U record this season (meaning 56 games have gone over the total runs line and 43 have gone under). The Mariners have a 49-45-7 O/U record.
Scoring Insights
- The Reds are averaging 4.2 runs per game this season (23rd in the league). Comparatively, the Mariners are averaging 4.1 (28th).
- In the field, the Reds are allowing 4.9 runs per game this season (23rd in the league), while the Mariners are allowing an average of 3.9 runs (4th).
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 Reds are at .230 (ranking 28th 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 119 (15th in the Major Leagues). Meanwhile, the Reds have managed 129 (9th).
Runs Batted In
- Finally, looking at their runs batted in, the Reds have recorded 395 RBIs to rank T25th in the MLB this season. Comparatively, the Mariners have recorded 395 RBIs to rank T25th.
Pitching Insights:
Earned Run Average
- The Mariners have an earned run average of 3.57 this season (5th in the Majors), while The Reds have an ERA of 4.60 (24th).
Strikeouts
- Turning our attention to total strikeouts, the Reds have recorded 800 this season, ranking 22nd in the MLB. Meanwhile, the Mariners rank 11th for total strikeouts, recording 871.
Opponent Batting Average
- Opponents are batting an average of .238 against the Mariners this season (13th in the Major Leagues). Comparatively, the Reds' opponents are at .249 (21st).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Reds | 21-27-51 | 9-12-29 | 12-15-22 | 9-6-16 | 12-21-35 | 0-0-0 | 2-2-6 |
| Mariners | 22-21-58 | 13-12-26 | 9-9-32 | 21-18-46 | 1-3-12 | 0-0-0 | 0-1-9 |
Lead After Three Innings
- Here are their records after the first three innings in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Reds | 31-39-29 | 15-19-16 | 16-20-13 | 12-10-9 | 19-29-20 | 0-0-0 | 3-2-5 |
| Mariners | 40-36-25 | 22-16-13 | 18-20-12 | 32-30-23 | 8-6-2 | 0-0-0 | 1-7-2 |
NRFI/YRFI
The NRFI market is paying -120 and the YRFI is paying -110.
- The NRFI is 49-50 in Reds games this season. The Mariners have a 53-48 NRFI record.
Last Time They Met
The Mariners recorded a lopsided 8-0 victory against the Reds at T-Mobile Park yesterday. Cal Raleigh went yard en route to that victory, hitting a home run to go with 5 RBIs. The Mariners have now won four straight at T-Mobile Park against the Reds.
