San Francisco Giants vs Seattle Mariners

San Francisco Giants at Seattle Mariners (2026-07-18). Logan Webb vs Bryan Woo at T-Mobile Park.

Starters — Webb enters with a 3.86 ERA, 1.16 WHIP, and 100.1 innings, backed by 7.18 K/9, 2.33 BB/9, and 0.72 HR/9. His last three starts were uneven: 7 IP and 5 ER on July 8, 3 IP and 7 ER on July 3, and 7 IP with 0 ER on June 27. The recent trend is up, but the game log shows volatility after one dominant outing. Woo carries a 4.23 ERA and 1.07 WHIP across 104.1 innings with stronger bat-missing and command indicators at 8.8 K/9 and 1.73 BB/9, plus 0.86 HR/9. His last three starts were 5 IP and 3 ER on July 7, 6.1 IP and 2 ER on June 30, and 4 IP with 5 ER on June 24. The listed trend is down, though two of his last three outings were steadier than the ERA suggests.

Teams — San Francisco has the better offensive profile on these numbers, posting a .730 OPS, .256 average, and 402 runs. The Giants are also 6-4 over their last 10, but their pitching staff has been less reliable overall with a 4.42 team ERA and 1.36 WHIP. Seattle has a lighter offensive baseline with a .686 OPS, .228 average, and 392 runs, and the Mariners are 3-7 in their last 10. The counter is run prevention: Seattle owns a 3.64 team ERA and 1.19 WHIP, clearly stronger than San Francisco’s staff marks. Bettors are looking at a matchup where the road lineup has been more productive, while the home club brings the cleaner full-team pitching foundation.