Mariners vs Rockies Prediction, Odds, Moneyline, Spread & Over/Under for Sept. 20

Odds updated as of 3:11 p.m.

MLB action on Sunday includes the Seattle Mariners facing the Colorado Rockies.

All the information you need to make smart wagers on this game at FanDuel Sportsbook can be found below. Check out all of the latest MLB betting lines here.

Mariners vs Rockies Game Info

• Seattle Mariners (72-83) vs. Colorado Rockies (57-98)
• Date: Sunday, September 20, 2026
• Time: 3:10 p.m. ET
• Venue: Coors Field -- Denver, Colorado
• Coverage: Rockies.TV and Mariners.TV

Mariners vs Rockies Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-154) | COL: (+130)
• Spread: SEA: -1.5 (+104) | COL: +1.5 (-125)
• Total: 10.5 -- Over: (-122) | Under: (+100)

Mariners vs Rockies Probable Starting Pitchers

Probable Pitchers: Kade Anderson (Mariners) - 1-2, 5.33 ERA vs Tomoyuki Sugano (Rockies) - 12-10, 5.49 ERA

This contest's pitching matchup is set, as the Mariners will send Kade Anderson (1-2) to the mound, while Tomoyuki Sugano (12-10) will take the ball for the Rockies. When Anderson starts, his team is 1-3-0 against the spread this season. Anderson's team has been victorious in 50% of the games he's started as the moneyline favorite with a record of 2-2. When Sugano starts, the Rockies have gone 16-10-0 against the spread. The Rockies are 14-12 in Sugano's 26 starts this season that they were the underdog on the moneyline.

Mariners vs Rockies Moneyline

• The Mariners vs Rockies moneyline has Seattle as a -154 favorite, while Colorado is a +130 underdog at home.

Mariners vs Rockies Spread

• The Rockies are +1.5 on the spread (-125 to cover), and Seattle is +104 to cover the runline.

Mariners vs Rockies Over/Under

• A total of 10.5 runs has been set for the Mariners-Rockies contest on Sept. 20, with the over available at -122 and the under at +100.

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Mariners vs Rockies Betting Trends

• The Mariners have won in 58, or 49.2%, of the 118 contests they have been named as odds-on favorites in this year.
• This season Seattle has come away with a win 20 times in 36 chances when named as a favorite of at least -154 on the moneyline.
• The Mariners and their opponents have hit the over in 81 of their 153 games with a total set by oddsmakers this season.
• The Mariners are 56-97-0 against the spread in their 153 games that had a posted line this season.
• The Rockies have won 36.5% of the games this season they were the moneyline underdog (54-94).
• Colorado has gone 30-74 in games it has played as a moneyline underdog with odds of +130 or longer (28.8%).
• In the 152 games bookmakers have set an over/under for the Rockies, they have combined with opponents to go over the total 75 times (75-74-3).
• The Rockies have collected an 80-72-0 record against the spread this season (covering 52.6% of the time).

Mariners Player Leaders

• Randy Arozarena leads Seattle in OBP (.377), slugging percentage (.484) and total hits (154) this season. He has a .281 batting average.
• Among qualified batters in MLB, his batting average ranks 21st, his on-base percentage ranks 10th, and he is 23rd in slugging.
• Arozarena has picked up at least one hit in eight games in a row. In his last 10 outings he is hitting .375 with three doubles, four home runs, three walks and nine RBIs.
• Josh Naylor has an OPS of .686, fueled by an OBP of .325 and a team-best slugging percentage of .361 this season. He's batting .270.
• His batting average ranks 41st among qualified players, his on-base percentage 76th, and his slugging percentage 120th.
• Julio Rodriguez has collected 139 base hits, an OBP of .303 and a slugging percentage of .397 this season.
• Cole Young has been key for Seattle with 137 hits, an OBP of .309 plus a slugging percentage of .387.

Rockies Player Leaders

• Jake McCarthy is batting .298 with 30 doubles, 12 triples, 15 home runs and 29 walks. He's slugging .488 with an on-base percentage of .341.
• Including all the qualified hitters in the big leagues, his batting average ranks eighth, his on-base percentage is 53rd, and he is 19th in slugging.
• McCarthy heads into this game on a three-game hitting streak. During his last five outings he is batting .333 with two triples, a walk and three RBIs.
• TJ Rumfield has a .392 OBP while slugging .454. Both lead his team. He has a batting average of .302.
• He is currently seventh in batting average, third in on-base percentage and 42nd in slugging percentage among all qualified hitters.
• Hunter Goodman has accumulated 120 hits, a team-high for the Rockies.
• Kyle Karros is batting .258 with 21 doubles, three triples, 12 home runs and 52 walks.

Mariners vs Rockies Head to Head

• 9/19/2026: 5-3 COL (Favorite: Mariners, Spread: -1.5, Total: 10.5, Favorite Moneyline: -154, Underdog Moneyline: +130)
• 9/18/2026: 5-4 SEA (Favorite: Mariners, Spread: -1.5, Total: 10.5, Favorite Moneyline: -186, Underdog Moneyline: +156)
• 9/25/2025: 6-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -320, Underdog Moneyline: +260)
• 9/24/2025: 9-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 7.5, Favorite Moneyline: -300, Underdog Moneyline: +245)
• 9/23/2025: 4-3 SEA (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -300, Underdog Moneyline: +245)
• 4/21/2024: 10-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 11, Favorite Moneyline: -118, Underdog Moneyline: -100)
• 4/21/2024: 2-1 COL (Favorite: Mariners, Spread: -1.5, Total: 10.5, Favorite Moneyline: -190, Underdog Moneyline: +160)
• 4/20/2024: 7-0 SEA (Favorite: Mariners, Spread: -1.5, Total: 9.5, Favorite Moneyline: -184, Underdog Moneyline: +154)
• 4/16/2023: 1-0 SEA (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -300, Underdog Moneyline: +245)
• 4/15/2023: 9-2 SEA (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -250, Underdog Moneyline: +205)

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