Seattle Mariners vs Boston Red Sox Prediction, 9/1/2026 MLB Picks, Best Bets & Odds

Game: Seattle Mariners vs Boston Red Sox

Date: Tuesday, September 1, 2026

Location: Fenway Park in Boston, MA

TV: NESN

Odds/Point Spread: Seattle (+110) Boston (-130)

The Seattle Mariners (64-73) are traveling to Fenway Park on Tuesday where they will take on the Boston Red Sox (74-63). The moneyline on this game has Seattle at +110 while Boston opens at -130. The total is 9. The men taking the mound are Bryan Woo and Sonny Gray.

Seattle has a slugging rate of .372 and have been called out on strikes 1,193 times, while drawing a walk on 459 occasions. They have earned 511 RBI's and 1,024 base knocks so far this season, while their average at the plate is at .227. The Mariners have accounted for 160 doubles as a team and have hit 157 balls out of the park. They have notched a total of 530 runs scored and have an on-base percentage of .307. As a unit, the Seattle Mariners are putting up 3.9 runs/g, which puts them at 30th in baseball.

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They have a K/BB ratio of 3.22 and their pitching staff has recorded a WHIP of 1.24. Mariners pitchers have allowed 161 home runs and 602 runs in total (14th in baseball). Seattle has relinquished 1,144 base knocks (8.5 per 9 innings) in addition to 558 earned runs. The Mariners have a team ERA of 4.16 for the season (16th in MLB), and they have struck out 1,157 batters. They have walked 359 players from the other team and their FIP is 3.94 as a squad over the course of the season.

The Mariners bullpen have compiled a save rate of 57.7% and have entered the game in 123 save situations. They have compiled 30 saves over the course of the season and have blown 22 of their 52 chances to save the game. The relief pitchers have inherited 138 runners so far this season and 31.2% of them ended up crossing the plate. Mariners bullpen pitchers have entered the game with runners on base 98 times in addition to having 137 appearances in high leverage situations. The Mariners have dispatched 415 relievers to the hill on the campaign. The relief pitchers have racked up 70 holds over the course of the season (20th in MLB).

The Mariners have turned 69.2% of balls in play into outs out of their 10,872 innings on the diamond, which has them sitting 23rd in professional baseball. The Seattle Mariners have a total of 3,624 putouts for the season, as well as 1,122 assists and 70 errors. Their fielding rate is currently at .985 which is 16th in professional baseball, and they have turned 112 double plays.

Woo has taken the ball for 537 innings and has totaled 534 strikeouts during his MLB career. Woo (37-24 career record) has a FIP of 3.46 and he has gone up against 2,155 batters in the major leagues. His ERA is 3.52 (210 ER's allowed) and he has a WHIP of 1.012. He has surrendered 434 hits (7.3 hits per 9 innings) and has 110 free passes.

The Red Sox have a slugging percentage of .403 and they are recording 4.45 runs per contest (16th in the league). They have hit 247 two-baggers, while taking a walk 440 times and notching 609 runs. Boston has recorded 138 HRs this season and 581 RBIs. They have been called out on strikes on 1,105 instances (22nd in MLB) and have accounted for 1,142 hits. The Boston Red Sox have earned an OBP of .323 in addition to a team batting average of .249 for the year.

The Red Sox have a WHIP of 1.232 with a FIP of 3.69 as a pitching staff this season. They currently have a strikeout to walk ratio of 8.60 (1,168 strikeouts vs 394 walks). They are currently ranked 15th in baseball as a staff in total hits surrendered with 1,105. They have surrendered 133 dingers and they yield 3.88 runs per 9 innings (5th in the league). The Boston pitching staff have allowed 525 runs on the year while holding an ERA of 3.57 (483 earned runs yielded).

They are ranked 3rd in the league holding a save rate of 75.5%, and they have sent 420 relievers to the mound over the course of the season. Their bullpen pitchers have come in 125 times in high leverage situations and on 108 occasions with runners on base. Sitting with 133 save situations, the Red Sox have accumulated 82 holds and also 12 blown saves. Boston has had bullpen pitchers take the mound in 49 save opportunities and they have converted 37 saves. Boston relief pitchers have an inherited score percentage of 30.3% out of their 145 inherited base runners.

The Boston Red Sox have gotten 98 double plays and have a fielding rate of .985 (18th in MLB). The Red Sox have racked up 1,185 assists, 75 errors and have notched a total of 3,652 putouts so far this year. Out of their 10,956 innings on the field, the Red Sox hold a defensive efficiency of 69.5% (21st in professional baseball).

During his MLB career, Gray has surrendered 1,807 base hits while he has earned 2,053 strikeouts in 2,061 innings. Gray (141-106 mark in his career) holds a 3.53 earned run average while giving up 7.9 hits per nine innings. He has surrendered 808 earned runs while earning a WHIP of 1.196 and a FIP of 3.5. His strikeout to walk ratio is 3.12 and he has faced 8,538 opposing hitters in his career.

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

Guy Bruhn's Pick: Take Seattle (+110)

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