Brewers vs Mariners Prediction, Odds, Moneyline, Spread & Over/Under for Aug. 20

Odds updated as of 10:11 p.m.

The MLB slate on Thursday includes the Milwaukee Brewers taking on the Seattle Mariners.

Here's what you need to know before checking out today's MLB odds and spreads on FanDuel Sportsbook.

Brewers vs Mariners Game Info

• Milwaukee Brewers (78-48) vs. Seattle Mariners (59-67)
• Date: Thursday, August 20, 2026
• Time: 2:10 p.m. ET
• Venue: American Family Field -- Milwaukee, Wisconsin
• Coverage: Brewers.TV and Mariners.TV

Brewers vs Mariners Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: MIL: (-126) | SEA: (+108)
• Spread: MIL: -1.5 (+172) | SEA: +1.5 (-210)
• Total: 8 -- Over: (-110) | Under: (-110)

Brewers vs Mariners Probable Starting Pitchers

Probable Pitchers: Robert Gasser (Brewers) - 3-5, 4.54 ERA vs George Kirby (Mariners) - 8-9, 3.89 ERA

This contest's pitching matchup is set, as the Brewers will send Robert Gasser (3-5) to the mound, while George Kirby (8-9) will answer the bell for the Mariners. Gasser's team is 6-8-0 against the spread in his starts this season. Gasser's team has won 70% of his starts when they are favored on the moneyline (7-3). The Mariners are 7-16-0 against the spread when Kirby starts. The Mariners were the underdog on the moneyline for one Kirby start this season -- they lost.

Brewers vs Mariners Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Brewers win (58.7%)

Brewers vs Mariners Moneyline

• Milwaukee is the favorite, -126 on the moneyline, while Seattle is a +108 underdog on the road.

Brewers vs Mariners Spread

• The Brewers are hosting the Mariners and are favored by 1.5 runs on the spread. The Brewers are +172 to cover the runline, with the Mariners being -210.

Brewers vs Mariners Over/Under

• Brewers versus Mariners on Aug. 20 has an over/under of 8 runs, with the odds on the over -110 and the under set at -110.

Bet on Milwaukee Brewers vs. Seattle Mariners on FanDuel today!

Brewers vs Mariners Betting Trends

• The Brewers have come away with 61 wins in the 94 contests they have been listed as the favorites in this season.
• This season Milwaukee has come away with a win 48 times in 76 chances when named as a favorite of at least -126 on the moneyline.
• The Brewers' games have gone over the total in 53 of their 126 opportunities.
• The Brewers are 66-60-0 against the spread in their 126 games that had a posted line this season.
• The Mariners have been the moneyline underdog 24 total times this season. They've gone 8-16 in those games.
• Seattle has a 5-7 record (winning 41.7% of its games) when playing as a moneyline underdog of +108 or longer.
• The Mariners have combined with opponents to hit the over on the total 61 times this season for a 61-58-6 record against the over/under.
• The Mariners have covered just 35.2% of their games this season, going 44-81-0 against the spread.

Brewers Player Leaders

• Brice Turang leads Milwaukee in slugging percentage (.448) thanks to 47 extra-base hits. He has a .267 batting average and an on-base percentage of .361.
• Among all qualifying hitters in baseball, he is 48th in batting average, 29th in on-base percentage, and 51st in slugging.
• Jake Bauers has 106 hits and an OBP of .387, both of which lead the Brewers this season. He's batting .278 and slugging .512.
• He is 30th in batting average, sixth in on-base percentage and 14th in slugging among qualifying hitters.
• Bauers brings a two-game streak with at least one hit into this contest. In his last five games he is hitting .500 with two doubles, a home run, six walks and five RBIs.
• William Contreras has collected 116 base hits, an OBP of .331 and a slugging percentage of .385 this season.
• Contreras enters this game with three games in a row with at least one hit. In his last five games he is batting .263 with a double, a home run, three walks and four RBIs.
• Jackson Chourio has been key for Milwaukee with 104 hits, an OBP of .337 plus a slugging percentage of .468.
• Chourio enters this game on a two-game hitting streak. During his last five outings he is hitting .286 with two doubles, a walk and two RBIs.

Mariners Player Leaders

• Randy Arozarena has racked up 120 hits, a team-high for the Mariners. He's batting .274 and slugging .454 with an on-base percentage of .366.
• Including all qualifying hitters in MLB, his batting average places him 37th, his on-base percentage is 24th, and he is 45th in slugging.
• Josh Naylor paces his team with a .372 slugging percentage. He has a batting average of .267 with an on-base percentage of .330.
• Including all qualified players, his batting average puts him 48th, his on-base percentage ranks 76th, and he is 118th in slugging.
• Julio Rodriguez is batting .256 with 18 doubles, 19 home runs and 40 walks.
• Cole Young has 15 doubles, three triples, 15 home runs and 31 walks while hitting .258.

Brewers vs Mariners Head to Head

• 8/18/2026: 22-0 MIL (Favorite: Brewers, Spread: -1.5, Total: 7.5, Favorite Moneyline: -168, Underdog Moneyline: +156)
• 7/23/2025: 10-2 MIL (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -126, Underdog Moneyline: +108)
• 7/22/2025: 1-0 SEA (Favorite: Mariners, Spread: -1.5, Total: 6.5, Favorite Moneyline: -132, Underdog Moneyline: +112)
• 7/21/2025: 6-0 MIL (Favorite: Mariners, Spread: -1.5, Total: 7, Favorite Moneyline: -124, Underdog Moneyline: +106)
• 4/7/2024: 12-4 MIL (Favorite: Brewers, Spread: -1.5, Total: 8.5, Favorite Moneyline: -134, Underdog Moneyline: +114)
• 4/6/2024: 5-3 SEA (Favorite: Brewers, Spread: -1.5, Total: 8.5, Favorite Moneyline: -118, Underdog Moneyline: -100)
• 4/5/2024: 6-5 MIL (Favorite: Brewers, Spread: -1.5, Total: 7.5, Favorite Moneyline: -126, Underdog Moneyline: +108)
• 4/19/2023: 5-3 MIL (Favorite: Mariners, Spread: -1.5, Total: 8.5, Favorite Moneyline: -136, Underdog Moneyline: +116)
• 4/18/2023: 6-5 MIL (Favorite: Mariners, Spread: -1.5, Total: 8, Favorite Moneyline: -168, Underdog Moneyline: +142)
• 4/17/2023: 7-3 MIL (Favorite: Brewers, Spread: -1.5, Total: 7.5, Favorite Moneyline: -148, Underdog Moneyline: +126)

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