| MATCHUP | Seattle Mariners | Boston Red Sox |
|---|---|---|
| Team Records | 64-73 | 74-63 |
| Spread | +1.5 -156 | -1.5 129 |
| Moneyline | +137 | -167 |
| Total | Over 8 (-107) | Under 8 (-113) |
| Where | Fenway Park, Boston, Massachusetts | |
| When | Monday, August 31, 2026 | |
| Time | 06:45 PM EDT | |
| TV | MLB.TV | |
Seattle Mariners Betting Preview
The Seattle Mariners enter Monday’s contest with a 64–73 overall record (3rd in the American League West) and a 27–42 mark on the road. The Seattle offense has been inconsistent this season. The Mariners have compiled just 530 runs scored (30th in MLB), 159 doubles, 157 home runs and a .228 team batting average which ranks 29th in Major League Baseball.The Seattle Mariners arrive at tomorrow evening’s game in below average form. More specifically, Seattle has lost five of the team’s last seven games played this season, including an 8–1 loss to the Toronto Blue Jays three days ago.
The Seattle Mariners will turn to right hander George Kirby in this game. In 25 starts made this season, Kirby has compiled a 9–10 win‑loss record, a 4.02 ERA, a 1.33 WHIP and 126 strikeouts in 147.2 innings pitched. Kirby arrives at this contest in subpar form, allowing five earned runs or more in two of his last three starts made in 2026.
Shifting our focus to the Seattle offense, the Mariners lineup features outfielder Randy Arozarena and first baseman Josh Naylor. Randy Arozarena has tallied a .271 batting average, 20 home runs, 56 walks, 58 RBIs and an .826 OPS. Josh Naylor has compiled a .271 batting average, 10 home runs and a .699 OPS.
Boston Red Sox Betting Preview
The Boston Red Sox enter Monday night’s matchup with a 74–63 overall record (3rd in the American League East) and a 34-32 record at home. Boston has played poor baseball recently, losing four of the team’s last five games, including a 1-0 shutout loss to the New York Yankees earlier this week.The Red Sox will start left hander Payton Tolle in tomorrow’s game. In 22 starts made in 2026, Tolle has compiled an 8–6 win‑loss record, a 3.09 ERA, a 1.09 WHIP and 141 strikeouts in 125.1 innings pitched. Tolle has pitched at a high level recently, allowing two earned runs or fewer in three of his last four starts made this season.
The Boston Red Sox lineup features outfielder Wilyer Abreu and first baseman Willson Contreras. Wilyer Abreu enters this contest with a .257 batting average, 23 home runs, 70 RBIs and an .805 OPS. Wilson Contreras has compiled a .285 batting average, 26 home runs (22nd in MLB), 79 RBIs and a .900 OPS which ranks sixth in Major League Baseball.
Why the Seattle Mariners will win.
• Offensive firepower. Randy Arozarena leads the Seattle Mariners lineup.• Starting pitching. In 25 starts made this season, George Kirby has compiled a 9–10 win‑loss record, a 4.02 ERA, a 1.33 WHIP and 126 strikeouts in 147.2 innings pitched.
• Motivation. The Seattle Mariners have lost five of the team’s last seven games.
Why the Boston Red Sox will win.
• Home field edge. The Boston Red Sox have amassed a 34-32 record at Fenway Park this season.• Enhanced motivation. The Boston Red Sox have lost four of the team’s last five games.
• Starting pitching. In 22 starts made in 2026, Payton Tolle has compiled an 8–6 win‑loss record, a 3.09 ERA, a 1.09 WHIP and 141 strikeouts in 125.1 innings pitched.