Seattle Mariners vs Milwaukee Brewers Prediction, Preview and Odds - 08/20/2026

Game Time: 2:10 pm ET, Thursday, August 20, 2026

Venue:  American Family Field, Milwaukee, WI

Where to Watch:  MLB TV

DraftKings:  Moneyline odds:  Mariners +108, Brewers -131; Over/Under:  8 runs

Bet365:  Moneyline odds:  Mariners +110, Brewers -130; Over/Under:  8 runs

BetMGM:  Moneyline odds:  Mariners +110, Brewers -130; Over/Under:  8 runs

Seattle Mariners:  59-67 (3rd place, AL West)

Milwaukee Brewers:  78-48 (1st place, NL Central)

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Seattle Mariners:  3-7 last 10

Milwaukee Brewers:  6-4 last 10

The Mariners are entering this series off a win and won their 3-game series against the Houston Astros 2-1 in their last series. They enter this game with a 59-67 record overall and have a road record of 26-38. This is the series finale of a 3-game series with the Brewers on Thursday with the 2nd game still to be played on Wednesday. The Mariners lost the series opener on Tuesday. Their offense ranks 27th in the MLB with a .686 OPS. Logan Gilbert is their starting pitcher on Wednesday while George Kirby is making his start in this game on Thursday. He is 8-9 with a 3.89 ERA this season. His team lost their last 2 straight games this season with him making an appearance. In his last MLB regular season appearance, he allowed 5 ER, 1 HR, and 3 BB with 2 SO on 8 hits through 4.2 IP against the Houston Astros.

The Brewers are entering this series off a win and won their 4-game series against the Los Angeles Dodgers 3-1 in their last series. They enter this game with a 78-48 record overall and have a home record of 42-22. This is the 3rd game of a 3-game series with the Mariners on Thursday with the 2nd game of this series still to be played on Wednesday. The Brewers won the 1st game of this series on Tuesday. Their offense ranks 7th in the MLB with a .733 OPS. Dustin May is their starting pitcher on Wednesday while Robert Gasser is making his start in this game on Thursday. He is 3-5 with a 4.54 ERA this season. His team won 4 of their last 5 games this season with him making an appearance. In his last MLB regular season start, he allowed 3 earned runs, 2 homers, and 1 walk with 7 strikeouts on 8 hits through 6.1 innings pitched against the Los Angeles Dodgers.

The current betting odds have the Brewers listed as a slight favorite in this game according to Draftkings Sportsbook. The Brewers have looked great in their games this season with their 78-48 record overall which has them right at the top of the NL Central with the best record in MLB. They have looked great in their own ballpark too with their 42-22 home record this season. Meanwhile, the Mariners haven't looked good in their games this season with their 59-67 record overall which has them right in the middle of the AL West. They haven't been a good road team either with their 26-38 road record this year. The Mariners are 3-7 in their last 10 games with one of the worst offenses in the league and they have looked terrible lately, slipping their way out of the playoff race. The Brewers did go through their own mini slump, but they won a 4-game series against the Dodgers over the weekend and have some momentum back on their side. The Brewers are 6-4 in their last 10 games now and they crushed the Mariners in the series opener, winning 22-0. The Mariners are going with Kirby in this one and he hasn't looked bad this season. He is 8-9 with a 3.89 ERA, but lately he has looked terrible. He is coming off another bad start in which he gave up 5 earned runs and the team has had more trouble with him lately, losing 2 games in a row now with him starting. The Brewers are going with Gasser in this one and he hasn't looked great this season either. He is 3-5 with a 4.54 ERA, but the team has been having a ton of success with him lately. He did give up 3 earned runs in his last start, but the team has won 4 of their last 5 games with him starting and the Brewers also have the much stronger offense here. They have one of the best home records in MLB too and one of the best bullpens to lean on. All signs point to the Brewers winning this one at home as the Mariners continue to slump. The best way to place a bet here is on the Brewers to win this game. 

Mariners Brewers Prediction:  Our MLB Pick for Thursday, August 20, 2026 (2:10 pm ET start time) is Brewers 6 Mariners 4.

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Seattle Mariners: 240-223 (-22.9 units) on the moneyline in all games. 104-128 (-33.7 units) on the moneyline in road games. 45-62 (-8.3 units) on the moneyline as an underdog of +100 to +150. 6-4 UNDER vs. NL teams allowing 4.0 or less runs/game on the season.

Milwaukee Brewers: 25-15 (+7.8 units) on the moneyline against AL West opponents. 272-191 (+51.8 units) on the moneyline in all games. 144-89 (+24.1 units) on the moneyline in home games. 12-5 UNDER at home when the money line is +125 to -125.

Seattle Mariners:  C. Emerson (SS) Ten Day IL - Wrist. C. Sulser (RP) Fifteen Day IL - Oblique. L. Raley (RF) Ten Day IL - Elbow. J. Crawford (SS) Ten Day IL - Wrist. W. Wilson (3B) Sixty Day IL - Thumb. M. Brash (RP) Fifteen Day IL - Lat. C. Criswell (RP) Sixty Day IL - Shoulder. C. Vargas (RP) Sixty Day IL - Lat. L. Evans (SP) Sixty Day IL - Arm.

Milwaukee Brewers:  B. Turang (2B) Day To Day - Knee. A. Uribe (RP) Fifteen Day IL - Forearm. C. Pratt (SS) Ten Day IL - Hamstring. S. Frelick (RF) Ten Day IL - Shoulder. J. Romero (RP) Fifteen Day IL - Appendix. R. Zastryzny (RP) Sixty Day IL - Shoulder. B. Woodruff (SP) Sixty Day IL - Shoulder. J. Kuhnel (RP) Fifteen Day IL - Shoulder. Q. Priester (SP) Sixty Day IL - Wrist. B. Fitzpatrick (RP) Sixty Day IL - Elbow. A. Zerpa (RP) Sixty Day IL - Forearm.

“Obviously, not how we wanted to start this game. It just got out of hand. They put up a lot of runs tonight, and we were quiet offensively. It’s a tough one to even think about.” - Dan Wilson after his team’s loss against the Brewers in their game on Tuesday. 

“I’d like to order that every night.” - Pat Murphy after his team’s win against the Mariners in their game on Tuesday.

Brendan Donovan (L) 3B

Randy Arozarena (R) LF

Dominic Canzone (L) DH

Julio Rodríguez (R) CF

Josh Naylor (L) 1B

Cole Young (L) 2B

Cal Raleigh (S) C

Victor Robles (R) RF

Brock Rodden (S) SS

Brice Turang (L) 2B

Jackson Chourio (R) LF

Jake Bauers (L) 1B

William Contreras (R) C

Christian Yelich (L) DH

Luis Lara (S) RF

Garrett Mitchell (L) CF

Joey Ortiz (R) SS

David Hamilton (L) 3B

Batting Average:  Brock Rodden (.308)

Hits:  Josh Naylor (121)

Home Runs:  Dominic Canzone (19)

RBI:  Cole Young (56)

Stolen Bases:  Josh Naylor (24)

Wins:  Logan Gilbert (9)

Saves:  Andrés Muñoz (22)

ERA:  Matt Brash (0.54)

Batting Average:  Jihwan Bae (.500)

Hits:  Brice Turang (120)

Home Runs:  Jake Bauers (22)

RBI:  Brice Turang (75)

Stolen Bases:  David Hamilton (24)

Wins:  Aaron Ashby (13)

Saves:  Trevor Megill (22)

ERA:  Easton McGee (0.00)

Managers:

Seattle Mariners: Dan Wilson (3rd season)

Milwaukee Brewers: Pat Murphy (3rd season)