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

Odds updated as of 1:12 p.m.

MLB action on Thursday includes the Milwaukee Brewers playing the Seattle Mariners.

Before you do any MLB betting on this game at FanDuel Sportsbook, here's what you need to know.

Brewers vs Mariners Game Info

• Milwaukee Brewers (78-49) vs. Seattle Mariners (60-67)
• 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: (-130) | SEA: (+120)
• Spread: MIL: -1.5 (+155) | SEA: +1.5 (-188)
• Total: 7.5 -- Over: (-118) | Under: (-104)

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

The Brewers will give the nod to Robert Gasser (3-5, 4.54 ERA), who is eyeing win No. 4 on the season, and the Mariners will counter with George Kirby (8-9, 3.89 ERA). When Gasser starts, his team is 6-8-0 against the spread this season. When Gasser starts a game and his team is the favorite on the moneyline, they have a record of 7-3. The Mariners have a 7-16-0 ATS record in Kirby's 23 starts that had a set spread. The Mariners were the moneyline underdog 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 (57.3%)

Brewers vs Mariners Moneyline

• Looking at the moneyline for Mariners-Brewers, Seattle is the underdog at +120, and Milwaukee is -130 playing at home.

Brewers vs Mariners Spread

• The Mariners are at +1.5 on the runline against the Brewers. The Mariners are -188 to cover the spread, and the Brewers are +155.

Brewers vs Mariners Over/Under

• A combined run total of 7.5 has been set for Brewers-Mariners on Aug. 20, with the over at -118 and the under at -104.

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

Brewers vs Mariners Betting Trends

• The Brewers have been favorites in 95 games this season and have come away with the win 61 times (64.2%) in those contests.
• This year Milwaukee has won 46 of 73 games when listed as at least -130 on the moneyline.
• The Brewers and their opponents have gone over in 54 of their 127 games with a total set by sportsbooks this season.
• The Brewers are 66-61-0 against the spread in their 127 games with a line set by sportsbooks this season.
• The Mariners have gone 9-16 in games they were the underdog on the moneyline (winning 36% of those games).
• Seattle is 2-3 (winning 40% of its games) when it has played as a moneyline underdog of +120 or longer.
• In the 126 games oddsmakers have set an over/under for the Mariners, they have combined with opponents to go over the total 62 times (62-58-6).
• The Mariners have covered just 35.7% of their games this season, going 45-81-0 against the spread.

Brewers Player Leaders

• Brice Turang leads Milwaukee with a slugging percentage of .444, fueled by 47 extra-base hits. He has a .265 batting average and an on-base percentage of .360.
• Among qualified hitters in MLB, he is 51st in batting average, 31st in on-base percentage, and 52nd in slugging.
• Jake Bauers has 106 hits and an OBP of .383, both of which lead the Brewers this season. He's batting .275 and slugging .505.
• Among qualifiers, he is 32nd in batting average, eighth in on-base percentage and 14th in slugging percentage.
• William Contreras is batting .257 with a .381 slugging percentage and 63 RBI this year.
• Jackson Chourio is batting .279 with a .340 OBP and 50 RBI for Milwaukee this season.
• Chourio heads into this game on a three-game hitting streak. During his last five outings he is hitting .364 with two doubles and an RBI.

Mariners Player Leaders

• Randy Arozarena leads the Mariners with 121 hits. He's batting .274 and slugging .452 with an on-base percentage of .366.
• Including all the qualifying hitters in MLB, his batting average places him 36th, his on-base percentage ranks 24th, and he is 47th in slugging.
• Josh Naylor paces his team with a .375 slugging percentage. He has a batting average of .270 with an on-base percentage of .333.
• Including all qualifying players, he is 46th in batting average, 73rd in on-base percentage and 118th in slugging percentage.
• Julio Rodriguez is batting .253 with 18 doubles, 19 home runs and 40 walks.
• Cole Young has 15 doubles, three triples, 15 home runs and 32 walks while hitting .256.

Brewers vs Mariners Head to Head

• 8/19/2026: 7-5 SEA (Favorite: Brewers, Spread: -1.5, Total: 7.5, Favorite Moneyline: -122, Underdog Moneyline: +112)
• 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)

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