Matchup: Seattle Mariners vs. Kansas City Royals
Scheduled Date: Thursday, September 18, 2025
Venue: Kauffman Stadium, Kansas City, MO
Broadcast: FanDuel Sports Network Kansas City
Betting Odds: Seattle Mariners (-182) vs. Kansas City Royals (+150)
Kauffman Stadium is set to host an exciting encounter between the Kansas City Royals (75-76) and the Seattle Mariners (83-68) on Thursday. The betting line for this matchup favors Seattle at -182, while Kansas City opens at +150. The over/under total is set at 8.5 runs, with Luis Castillo and Stephen Kolek anticipated as the starting pitchers.
The Seattle Mariners are currently averaging 4.8 runs per game, ranking them 10th in Major League Baseball. They have accumulated a total of 717 runs with an on-base percentage of .321. The team has recorded 218 doubles and 221 home runs, totaling 687 RBIs with 1,256 hits this season. Their batting average stands at .244, along with a slugging percentage of .419, having faced 1,334 strikeouts and drawn 513 walks.
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The Mariners carry a team ERA of 3.92 this season (ranked 14th in MLB) and have struck out 1,321 batters. They have surrendered 181 home runs and a total of 659 runs (16th in the league). With 434 walks issued, their FIP stands at 4.04 for the year. Seattle has allowed 1,253 hits (averaging 8.3 per nine innings) and recorded 594 earned runs, achieving a K/BB ratio of 3.04 and a collective WHIP of 1.24.
This season, Seattle has utilized 513 relief pitchers, inheriting 137 runners with 25.5% of those scoring. They’ve managed 40 saves out of 64 save opportunities, resulting in a save percentage of 62.5%. The Mariners’ relievers have appeared in 149 save situations, achieving 85 holds this season (15th in MLB). They have faced 126 situations with runners on base and made 205 appearances in crucial moments.
The San Francisco Giants have completed 4,094 putouts this year, alongside 1,271 assists and 65 errors. Their fielding percentage stands at .988, placing them 7th overall and leading to 110 double plays turned. The Mariners convert 70.2% of batted balls into outs from 12,282 innings played, which ranks them 13th in MLB.
Castillo has pitched 1,397 innings, striking out 1,480 batters throughout his career. Holding a career win-loss record of 82-84, Castillo’s FIP is 3.53 after facing 5,780 hitters in Major League Baseball. He has maintained an ERA of 3.58, allowing 556 earned runs and holding a WHIP of 1.186, conceding 1,204 hits (averaging 7.8 hits per nine innings) and issuing 453 walks.
This season, Kansas City has hit 146 home runs and driven in 572 runs. They have recorded 264 doubles and drawn 400 walks, scoring a total of 582 runs. The Royals boast a team on-base percentage of .305 and a batting average of .244. Currently, they hold a slugging percentage of .391 and average 3.85 runs per game (28th in the league). They have struck out 1,021 times (30th in the league) and accumulated 1,227 hits.
The Royals pitching staff has a WHIP of 1.258 and a FIP of 4.05 this season. They rank 14th in total hits allowed with 1,235. The Kansas City pitchers have conceded 601 runs, holding an ERA of 3.78 (562 earned runs). Their K/BB ratio registers at 7.90 (1,179 strikeouts versus 450 walks), allowing 160 home runs while yielding 4.04 runs per nine innings (4th in MLB).
Throughout the season, Kansas City’s bullpen has been called into 63 save opportunities, securing 44 saves. With a save percentage of 69.8%, they rank 3rd in Major League Baseball and have utilized 510 relievers this season. Their relief pitchers have entered the game in 161 high-leverage situations and 152 times with inherited base runners, with a scoring rate of 26.6% for 207 inherited runners. The Royals have recorded 122 double plays and maintain a fielding percentage of .989 (5th in MLB), logging 1,336 assists, committing 58 errors, and completing 4,017 putouts over the course of the season. Their defensive efficiency stands at 70.6% from 12,051 innings played (9th in MLB).
During his career, Kolek has allowed 150 hits with a total of 106 strikeouts in 145 innings pitched. With a career record of 8-5, he’s maintained an ERA of 4.21, permitting 9.3 hits per nine innings, alongside 68 earned runs, holding a WHIP of 1.308 and a FIP of 4.1. He has faced 621 opposing batters throughout his career.
Who will emerge victorious in tonight’s MLB clash against the spread or moneyline?
Josh Schonwald’s Prediction: Back Seattle (-182)
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