San Francisco Giants vs Seattle Mariners Picks and Prediction for Saturday, July 18, 2026
Use Code SSWC The San Francisco Giants visit the Seattle Mariners at T-Mobile Park in Seattle, Washington, on Saturday, July 18, 2026, with the first pitch scheduled for 8:08 p.m. ET. MLB.TV and FOX will provide coverage. San Francisco enters at 41-55 overall and 19-30 on the road, while Seattle is 48-49 overall and 27-20 at home. The matchup predictor gives the Giants a 47.1% chance to win and the Mariners a 52.9% probability. At the time of this writing the odds were not released. Be sure to check out our free MLB picks.
Starting Pitchers
Logan Webb is scheduled to start for San Francisco against Seattle right-hander Bryan Woo. Webb enters with a 5-7 record, 3.86 ERA, and 1.16 WHIP through 100.1 innings. He has allowed 90 hits and eight home runs while recording 80 strikeouts and issuing 26 walks. Woo carries a 7-6 record, 4.23 ERA, and 1.07 WHIP across 104.1 innings. He has surrendered 92 hits and 10 home runs while collecting 102 strikeouts and allowing 20 walks. Webb owns the lower ERA, while Woo holds the better record, lower WHIP, and higher strikeout total.
San Francisco Arrives With Better Recent Results
San Francisco enters Saturday’s contest with a 41-55 overall record and a 19-30 mark away from home. The Giants have won three of their last five games. They recently defeated Colorado 3-1, 4-2, and 8-2 while losing 4-3 to the same opponent. San Francisco also recently lost 10-0 to Toronto.
The Giants are batting .256 with 840 hits, 395 runs, and 106 home runs. Their offense has produced a .310 on-base percentage and a .420 slugging percentage. San Francisco’s pitching staff owns a 4.46 ERA and a 1.37 WHIP while allowing opponents to bat .248. The Giants have issued 361 walks and recorded 732 strikeouts. They have posted a 23-36 record in night games.
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San Francisco’s primary strength is its overall hitting advantage. The Giants lead Seattle by 26 points in batting average, 104 hits, three runs, and 40 points in slugging percentage. They have also won three of their last four games. However, San Francisco’s road and night records remain significant weaknesses. Its pitching staff also trails Seattle in ERA, WHIP, strikeouts, and opponent batting average.
Seattle Tries to Reset Behind Its Home Advantage
Seattle comes into the matchup at 48-49 overall with a 27-20 record at T-Mobile Park. The Mariners have won only one of their last five games, although that victory came in their most recent contest. Seattle recently defeated Tampa Bay 8-2 after losing 6-1 and 7-2 to the same opponent. The Mariners also recently lost 8-4 and 2-0 to Miami.
The Mariners are batting .230 with 736 hits, 392 runs, and 115 home runs. Seattle has recorded a .310 on-base percentage and a .380 slugging percentage. Its pitching staff carries a 3.61 ERA and a 1.18 WHIP while holding opponents to a .240 batting average. The Mariners have issued 242 walks and collected 825 strikeouts. Seattle owns a 28-33 record in night games.
Seattle’s clearest strength is its pitching profile. The Mariners’ team ERA is 0.85 lower than San Francisco’s, while their WHIP is 0.19 lower. Seattle has also recorded 93 more strikeouts while issuing 119 fewer walks. The offense trails the Giants in several categories, but the Mariners have hit nine more home runs. Their 27-20 home record is another meaningful advantage against a San Francisco team that is 19-30 on the road.
San Francisco Giants vs Seattle Mariners Picks and Prediction
San Francisco Giants vs Seattle Mariners Pick
- Pick: Seattle Mariners Moneyline
Seattle is my preferred side based on its strong home record, superior team pitching statistics, and 52.9% matchup-predictor probability. San Francisco owns the better recent record and holds clear advantages in batting average, hits, and slugging percentage. However, the Mariners counter with substantial advantages in ERA, WHIP, walks allowed, strikeouts, and opponent batting average. Seattle’s scheduled starter also has the lower WHIP and higher strikeout total. Those pitching and home-field numbers support the Mariners in a close contest.
San Francisco Giants vs Seattle Mariners Total Pick
- Pick: Under 8.5
Take the under if the total is set at 8.5. I favor the under because both scheduled starters have WHIPs of 1.16 or lower and have each worked at least 100 innings. The Seattle pitching staff owns a 3.61 ERA and 1.18 WHIP, while the Giants have scored only 395 runs and the Mariners have produced 392. Three of San Francisco’s last four games finished with seven or fewer combined runs, and Seattle was held to two runs or fewer in four consecutive games before its latest victory. The supplied pitching and scoring figures support the under at 8.5.
Final Score Prediction: Seattle Mariners 4 – San Francisco Giants 3
This prediction was written before the completion of game play on Friday.
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