Matchup: St. Louis Cardinals vs Seattle Mariners
Date: Monday, September 8, 2025
Venue: T-Mobile Park, Seattle, WA
Broadcast: Root Sports Northwest
Betting Odds: St. Louis (+110) Seattle (-132)
This matchup will take place at T-Mobile Park, where the Seattle Mariners (73-67) will host the St. Louis Cardinals (70-71) on Monday. The current moneyline shows St. Louis at +110 and Seattle at -132. The total runs line is fixed at 8.5, with expected starters Miles Mikolas and Bryan Woo taking the mound.
The St. Louis Cardinals are averaging 4.4 runs per game, ranking them 17th in the league. They have achieved a total of 613 runs and an on-base percentage (OBP) of .315. As a squad, they have hit 229 doubles and 135 home runs, accumulating 584 RBIs along with 1,166 hits this season. The team’s batting average is currently at .247, with a slugging percentage of .384. They have recorded 1,121 strikeouts while also drawing 421 walks.
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This season, the Cardinals have a team earned run average (ERA) of 4.27, placing them 20th in the MLB. The pitching staff has struck out a total of 1,041 batters, conceded 146 home runs, and allowed 649 runs (22nd in the league). They have issued 394 walks and have a FIP (Fielding Independent Pitching) of 4.04. St. Louis has given up 1,239 hits (9.0 per nine innings), with 591 of these being earned runs. Their strikeout-to-walk (K/BB) ratio stands at 2.64, and the team has a WHIP (Walks and Hits per inning Pitched) of 1.31.
The Cardinals’ bullpen has a save percentage of 66.1%, having entered 139 save situations. They have inherited 185 runners this season, with 33.0% resulting in scored runs. This year, Cardinals pitchers have faced runners on base 134 times and made 132 appearances in high-pressure situations. A total of 414 relief pitchers have taken the mound, and the bullpen has achieved 80 holds (12th in MLB). They have recorded 37 saves out of 56 opportunities, with 19 blown saves.
St. Louis has made 3,737 putouts, along with 1,353 assists and 69 errors this season. Their fielding percentage is at .987, ranking them 13th in professional baseball, with 109 double plays. The Cardinals have managed to convert 69.1% of balls hit in play into outs across 11,211 innings played, positioning them 22nd in the league.
Pitcher Mikolas has logged 1,232 innings in his career, amassing 881 strikeouts with an earned run average of 4.24 (580 earned runs allowed) and a WHIP of 1.217. He has allowed 1,257 hits (an average of 9.2 hits per nine innings) and has issued 242 walks. Mikolas has a career record of 71-74 and faces approximately 5,135 batters in major league competition.
On the other hand, the Seattle Mariners have delivered an on-base percentage of .317 and a batting average of .241 this season. They have struck out 1,245 times (ranking 4th in the league) and have recorded 1,145 hits. The Mariners have hit 200 home runs and collected 613 RBIs this season. They hold a team slugging percentage of .410 and an average of 4.56 runs per game (12th in the league). The team has successfully hit 188 doubles, drawn 468 walks, and scored 638 runs.
The Mariners boast a WHIP of 1.264 with a team FIP of 4.13 this season. Their K/BB ratio is 8.50 (1,193 strikeouts against 416 walks). Currently ranked 21st in the league, they have surrendered a total of 1,176 hits. Seattle has allowed 169 home runs and gives up an average of 4.48 runs per nine innings (18th in MLB). Their pitching staff has an overall ERA of 4.05, having allowed 566 earned runs so far this season.
With 135 save situations this season, the Mariners have 77 holds and 22 blown saves. Their relievers have entered 58 save opportunities and have successfully converted 36 saves. In high-pressure circumstances, their bullpen has made 188 appearances, also pitching 114 times with base runners. The inherited score percentage stands at 25.2% with 127 inherited runners this year. Seattle ranks 19th in MLB with a save rate of 62.1%, having utilized 470 relief pitchers this season.
Across 11,337 innings, Seattle boasts a defensive efficiency rate of 70.1% (12th in MLB). The Mariners have successfully turned 103 double plays and have a fielding percentage of .988 (7th in the league). They have tallied 1,177 assists, committed 59 errors, and recorded 3,779 putouts this season.
In his career, Woo has allowed 301 hits while racking up 363 strikeouts in 378 innings on the mound. His career record stands at 25-15 with a 3.26 ERA, allowing 7.2 hits per nine innings. With a WHIP of 1.002 and a FIP of 3.2, he has allowed 137 earned runs and maintains a strikeout-to-walk ratio of 4.65, facing 1,514 batters in his professional journey.
Who will prevail in today’s MLB matchup against the spread or moneyline?
Tony Sink’s Prediction: Back St. Louis (+110)
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