Chicago Cubs vs Seattle Mariners Picks and Prediction for Saturday August 22, 2026

The Chicago Cubs and Seattle Mariners meet Saturday, August 22, at T-Mobile Park in Seattle, Washington. First pitch is scheduled for 7:15 p.m. ET with coverage on FOX and MLB.TV. Chicago enters at 74-54 overall and 36-27 on the road, while Seattle is 60-68 overall and 33-29 at home. The Cubs are second in the NL Central, five games behind Milwaukee, while the Mariners sit four games back in the AL West. At the time of this writing the odds were not released. Be sure to check out our free MLB picks throughout the season for more MLB predictions and analysis.

Starting Pitchers

Chicago is expected to start David Peterson, who is 7-7 with a 5.29 ERA and 1.53 WHIP through 112.1 innings. Peterson has allowed 125 hits while recording 95 strikeouts and 47 walks, with 11 home runs surrendered. Seattle counters with Kade Anderson, who does not yet have MLB season statistics listed in the information available for this matchup. That uncertainty makes the starting-pitching comparison more difficult than usual, but Chicago's 5.29 ERA starter has hardly provided a dominant baseline himself.

Cubs Need Their Offense to Rebound

Chicago enters this matchup with a strong 74-54 record and has been particularly effective away from home at 36-27. Recent results have been considerably less convincing. The Cubs have dropped three of their last five, including an 11-4 loss to St. Louis and a 3-0 shutout loss to the White Sox. Their two victories during that stretch came by scores of 7-5 in 10 innings and 4-3.

The season-long offensive numbers remain one of Chicago's biggest advantages. The Cubs are batting .248 with 656 runs, 1,089 hits and 164 home runs. They have produced a .337 on-base percentage and .418 slugging percentage, giving them significant advantages over Seattle in virtually every major offensive category.

Chicago's biggest concern is its pitching. The Cubs carry a 4.14 team ERA and 1.26 WHIP, and Saturday's starting matchup could leave the Mariners with opportunities to score. Still, Chicago's offense has produced 156 more runs than Seattle this season, which is difficult to ignore when assessing the side.

Mariners Try to Capitalize at T-Mobile Park

Seattle enters at 60-68 overall but has been much more competitive at home, where it owns a 33-29 record. The Mariners have won three of their last five despite coming off a 7-4 loss at Milwaukee. That stretch also includes victories of 7-5 over Milwaukee and 10-5 and 3-2 over Houston. The glaring exception was a 22-0 loss to Milwaukee.

Seattle's offensive production has been considerably weaker than Chicago's over the full season. The Mariners are hitting .230 with 500 runs, 972 hits and 145 home runs. Their .310 on-base percentage and .375 slugging percentage both trail Chicago by a meaningful margin.

Pitching has kept Seattle competitive. The Mariners own a 4.00 ERA and 1.23 WHIP, giving them modest advantages over Chicago's 4.14 and 1.26 marks. The question Saturday is whether those pitching advantages are enough to overcome an offense that has scored substantially fewer runs. Seattle's home record provides some reason for optimism, but the Cubs have also been a strong road team.

Chicago Cubs vs Seattle Mariners Picks and Prediction

Pick: Chicago Cubs Moneyline

Chicago is my side despite the uncertainty surrounding Seattle's starter. The Cubs have been the much better team over the full season, entering 20 games above .500 compared with Seattle's eight games below. Chicago also owns a 36-27 road record, so playing at T-Mobile Park doesn't significantly reduce my confidence in the Cubs.

The biggest separator is offensive production. Chicago has scored 656 runs compared with Seattle's 500 while also holding advantages in batting average, on-base percentage, slugging percentage and home runs. Seattle has the slightly better team pitching numbers, but the difference isn't large enough to offset Chicago's substantial offensive advantage. Take the Cubs on the moneyline.

Pick: Over

The betting total was not available at the time of this writing, but I would take the over if the total is set at 8.0 or lower.

Chicago's expected starter enters with a 5.29 ERA and 1.53 WHIP, creating an opportunity for a Seattle offense that has shown some recent life. The Mariners have scored at least seven runs twice in their last five games, while Chicago has allowed five or more runs in three of its last five.

There is also uncertainty surrounding Seattle's expected starter because no major-league season statistics are listed in the provided information. Combine that with Chicago's 656 runs and 164 home runs, and I would rather attack the over than trust either pitching situation enough to play the under. At 8.5, however, the wager becomes considerably less attractive.

This preview was completed before the start of play on Friday