MLB Prop Bets: Colorado Rockies vs Seattle Mariners (September 20, 2026)
The Seattle Mariners (72-83) face the Colorado Rockies (57-98) at Coors Field on Sunday at 3:10pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Kade Anderson is the probable pitcher for the Mariners, while Tomoyuki Sugano is the probable pitcher for the Rockies. The Mariners are favored to win at -162, while the Rockies are at +134. The total runs line is set at 11.0, with OVER at -101 and UNDER at -119.
- The Mariners (-105) have a 59-96 Run Line record this season, while the Rockies (-115) hold a record of 81-74.
- The Mariners have an 80-66-9 O/U record this season (meaning 80 games have gone over the total runs line, 66 have gone under and nine have resulted in a push). The Rockies have a 74-73-8 O/U record.
Scoring Insights
- The Mariners are averaging 4.1 runs per game this season (28th in the league). Comparatively, the Rockies are averaging +0.6 more at 4.7 runs (6th).
- In the field, the Mariners are allowing 4.4 runs per game this season (15th in the league), while the Rockies are allowing an average of 5.8 runs (30th).
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 Rockies are at an impressive .255 (ranking 4th in the Major leagues), while the Mariners are batting an underwhelming .232 (29th).
Home Runs
- In terms of total home runs this season, the Rockies have hit 169 (20th in the Major Leagues). Meanwhile, the Mariners have managed 179 (T12th).
Runs Batted In
- Finally, looking at their runs batted in, the Rockies have been outstanding this season, recording 695 RBIs to rank 6th in the MLB. Comparatively, the Mariners have performed poorly in this area, recording only 609 RBIs to rank 28th.
Pitching Insights:
Earned Run Average
- The Rockies have an earned run average of 5.60 this season (30th in the Majors), while The Mariners have an ERA of 4.21 (20th).
Strikeouts
- Turning our attention to total strikeouts, the Mariners have recorded 1318 this season, ranking 12th in the MLB. Meanwhile, the Rockies rank 30th for total strikeouts, recording 1066.
Opponent Batting Average
- Opponents are batting an average of .289 against the Rockies this season (30th in the Major Leagues). Comparatively, the Mariners' opponents are at .252 (23rd).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 38-41-76 | 21-17-37 | 17-24-39 | 31-28-58 | 7-13-18 | 0-0-0 | 4-3-3 |
| Rockies | 34-55-66 | 24-27-26 | 10-28-40 | 1-2-1 | 33-53-65 | 0-0-0 | 1-6-3 |
Lead After Three Innings
The Mariners are -160 to lead after three innings, while the Rockies are +124.
- Here are their records after the first three innings in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Mariners | 61-58-36 | 32-25-18 | 29-33-18 | 44-41-32 | 17-17-4 | 0-0-0 | 3-3-4 |
| Rockies | 41-78-36 | 26-34-17 | 15-44-19 | 1-2-1 | 40-76-35 | 0-0-0 | 1-7-2 |
NRFI/YRFI
The NRFI market is paying +105 and the YRFI is paying -135.
- The NRFI is 69-86 in Mariners games this season. The Rockies have a 60-95 NRFI record.
Last Time They Met
The Rockies recorded a 5-3 victory over the Mariners at Coors Field yesterday. Cal Raleigh was unstoppable in that matchup, hitting a home run, a double and recording 2 RBIs. That result snapped the Mariners' five-game winning streak against the Rockies.
