Seattle Mariners vs Milwaukee Brewers Prediction, 8/20/2026 MLB Picks, Best Bets & Odds

Game: Seattle Mariners vs Milwaukee Brewers

Date: Thursday, August 20, 2026

Location: American Family Field in Milwaukee, WI

TV: Brewers.TV

Odds/Point Spread: Seattle (+125) Milwaukee (-145)

The Seattle Mariners (59-67) are headed to American Family Field on Thursday where they will go up against the Milwaukee Brewers (78-48). The moneyline on this matchup has Seattle at +125 and Milwaukee is coming in at -145. The total comes in at 8. The starting pitchers will be George Kirby and Robert Gasser.

As a team, the Seattle Mariners are scoring 3.9 runs per contest, which puts them at 30th in the league. They have accumulated 489 runs scored while holding a team on-base percentage of .309. The Mariners have hit 154 doubles as a unit and have hit 145 baseballs out of the stadium. They have amassed 473 RBI's in addition to 956 hits for the season, and their team batting average sits at .229. Seattle has a slugging rate of .377 and have been called out on strikes 1,079 times, while taking a walk on 417 occasions.

Get all of our MLB Picks

They have earned a K/BB ratio of 3.35 and the pitching staff sits with a WHIP of 1.22. Mariners pitchers have surrendered 141 home runs and 534 runs in total (9th in MLB). Seattle has surrendered 1,041 hits (8.4 per 9 innings) in addition to 490 earned runs. The Mariners have a team ERA of 3.97 for the season (11th in baseball), and they have struck out 1,066 batters. Their pitching staff has walked 318 opposing hitters and their FIP sits at 3.82 as a squad this year.

The Mariners relievers have a save percentage of 58.3% and have come into the game in 115 save situations. They have earned 28 saves this season and have not converted 20 of their 48 save chances. The relief pitchers have inherited 123 base runners on the campaign with 30.1% of them crossing the plate. Mariners relief pitchers have gone to the mound with players on base 88 times in addition to having 130 appearances in high leverage situations. The Mariners have dispatched 378 relievers to the hill this year. The relief pitchers have accumulated 66 holds for the season (17th in baseball).

The Mariners have turned 69.3% of balls in play into outs out of their 10,008 innings on the diamond, which has them sitting 23rd in pro baseball. The Seattle Mariners have earned 3,336 putouts at this point in the season, as well as 1,027 assists and 64 errors. Their fielding percentage is at .986 which is 16th in the majors, and they have turned 102 double plays.

Kirby has pitched in 773 innings and has accumulated 735 punch outs so far in his pro baseball career. His ERA is 3.64 (313 ER's allowed) and his career WHIP is 1.148. He has surrendered 764 hits (8.9 hits per nine innings) and has had 124 free passes. Kirby (53-43 career win-loss mark) sits with a FIP of 3.59 while facing 3,168 hitters in the majors.

The Brewers hold a team SLG% of .396 and they average 5.00 runs per contest (4th in baseball). They have hit 222 two-baggers, while walking 527 times as well as racking up 630 runs. Milwaukee has knocked in 117 long balls this season and 592 runs batted in. They have been rung up on 1,056 occasions (16th in MLB) and have tallied 1,076 hits. The Milwaukee Brewers have compiled an OBP of .337 and a batting average of .252 for the year.

The Milwaukee pitching staff have given up 472 runs on the year while holding an ERA of 3.43 (429 earned runs allowed). They have relinquished 129 HR's and they allow 3.77 runs per 9 innings (2nd in the league). The Brewers have a team WHIP of 1.156 in addition to having a FIP of 3.58 as a pitching staff over the course of the season. Their K/BB ratio comes in at 9.80 (1,221 strikeouts vs 393 bases on balls). They are sitting at 1st in MLB as a staff in total hits allowed with 909.

Milwaukee relievers hold an inherited score rate of 41.3% out of their 138 inherited runners. Their bullpen pitchers have come in 125 times in high leverage situations in addition to 99 occasions with runners on base. With 122 save situations, the Brewers have tallied 63 holds and also 18 blown saves. They sit at 9th in baseball holding a save rate of 69.0%, and they have dispatched 382 relievers to the mound so far this season.

The Milwaukee Brewers have turned 94 double plays and have a fielding rate of .987 (9th in the majors). The Brewers have accrued 981 assists, 56 errors and have earned a total of 3,379 putouts over the course of the season. In 10,137 innings on the diamond, the Brewers have earned a defensive efficiency of 71.3% (6th in pro baseball).

Gasser (5-7 career win-loss record) has a 3.98 ERA while giving up 8.9 hits per 9 innings. His K/BB ratio is 3.71 and he has gone up against 457 hitters so far in his MLB career. He has allowed 47 ER's while holding a WHIP of 1.214 and having a FIP of 3.9. During his MLB career, Gasser has given up 105 base hits and he has 89 punch outs in 106 innings pitched.

Who will win tonight's MLB game against the spread or moneyline?

Guy Bruhn's Pick: Take Seattle (+125)

Get $60 worth of FREE premium member picks. No Obligation. No Salesman. No Credit Card. Fast Sign up with Instant Access Click Here

Get MLB picks on every single game, or if you want our very best bets by the experts, sign up for your free $60 account with a guarantee.