Seattle Mariners vs Athletics Picks and Prediction for Sunday September 13 2026

The Seattle Mariners visit the Athletics at Sutter Health Park in Sacramento, California, on Sunday, September 13, 2026. First pitch is scheduled for 4:05 PM ET with coverage on MLB.TV. Seattle enters at 69-79 overall and 29-44 on the road, while the Athletics are 60-88 overall and 28-45 at home. The Athletics won the series opener 6-5 in 10 innings and come into Sunday having won two straight, while Seattle has dropped back below .500 over its last five games. At the time of this writing the odds were not released. Be sure to check out our free MLB picks for more MLB predictions throughout the season.

Starting Pitchers

Seattle is scheduled to start Bryce Miller, who enters at 4-9 with a 4.22 ERA and 1.14 WHIP through 102.1 innings. He has allowed 88 hits and 18 home runs while recording 101 strikeouts against 29 walks. The Athletics counter with Jacob Lopez, who is 6-4 with a 4.78 ERA and 1.45 WHIP across 111 innings. He has surrendered 108 hits and 19 home runs while striking out 104 and walking 53. Seattle owns the clearer starting-pitching advantage based on ERA, WHIP, walk rate and overall baserunner prevention.

Seattle Owns the Better Pitching Profile

Seattle enters Sunday at 69-79 overall and 29-44 away from home. The Mariners are 3-2 over their last five games, with victories by scores of 4-3, 3-2 and 2-0. Their losses came by scores of 10-5 and 6-5 in 10 innings. Seattle has generally been competitive during this stretch and has shown the ability to win lower-scoring games when its pitching holds up.

The Mariners are batting .229 with 586 runs, 1,122 hits and 166 home runs. They own a .309 on-base percentage and .374 slugging percentage. Seattle's pitching staff has produced a 4.22 ERA and 1.25 WHIP while opponents are batting .251. The Mariners have recorded 1,259 strikeouts against 390 walks and are 30-25 in day games.

Seattle's strongest edge is on the mound. The Mariners have a substantially better team ERA and WHIP than the Athletics, along with a much lower walk total and stronger opponent batting average. The weakness is clearly offense, where Seattle trails in batting average, runs, hits, home runs, on-base percentage and slugging percentage. If the Mariners can avoid giving away free baserunners, their pitching advantage gives them a realistic path to controlling the game.

Athletics Bring the Stronger Offensive Numbers

The Athletics enter Sunday at 60-88 overall and 28-45 at home. They are 3-2 over their last five games and have won two straight, including the 6-5 extra-inning victory over Seattle in the series opener. Their other recent wins came by scores of 2-0 and 6-5, while their two losses were 4-2 and 2-0. The recent results have been more competitive than the overall season record suggests.

The Athletics are batting .246 with 647 runs, 1,236 hits and 180 home runs. They own a .319 on-base percentage and .404 slugging percentage. The pitching staff carries a 5.33 ERA and 1.49 WHIP while opponents are batting .268. The Athletics have recorded 1,243 strikeouts against 580 walks and are 18-29 in day games.

The Athletics' advantage comes almost entirely from the offense. They lead Seattle in every major batting category provided, including average, runs, hits, home runs, on-base percentage and slugging percentage. The concern is a pitching staff that has struggled badly over the full season. A 5.33 team ERA and 1.49 WHIP leave very little margin for error, and that becomes especially important against a Seattle starter with the better control and baserunner profile.

Seattle Mariners vs Athletics Picks and Prediction

Pick: Seattle Mariners Moneyline

The Seattle Mariners Moneyline is the preferred side. The Athletics have the stronger offense and better recent momentum, but Seattle owns the more dependable pitching profile and a clear edge in the scheduled starting matchup. The Mariners have also performed much better in day games, posting a 30-25 record compared with the Athletics' 18-29 mark. With Seattle holding major advantages in team ERA, WHIP and walk prevention, the visitors are the more trustworthy side if the pitching matchup plays to form.

Pick: Over 8.5

Take the Over if the total is set at 8.5 or lower. The Athletics own a 5.33 team ERA and 1.49 WHIP, while Seattle has already allowed five or more runs in two of its last five games. The Athletics also carry the stronger offensive statistics, with a .246 batting average, 180 home runs and a .404 slugging percentage. Seattle's pitching advantage keeps this from being an automatic high-scoring spot, but the weakness of the Athletics' staff and the offensive gap between these clubs make the Over attractive at 8.5 or lower.

Final Picks: Seattle Mariners Moneyline and Over 8.5

This preview was completed on Saturday. Starting pitchers, betting lines and other game information are subject to change before the game begins.