The Texas Rangers and Seattle Mariners open up a four-game set at T-Mobile Park on Thursday.
The pregame narrative: Both teams sport identical 57-52 records and are tied for the AL’s final wild-card spot entering play on July 31, so this is a big one. Kumar Rocker starts for Texas, and he’s been dreadful on the road, while George Kirby will throw for Seattle.
Check out my Rangers vs. Mariners predictions, featuring Josh Naylor and Julio Rodriguez.
Rangers vs. Mariners predictions
Parlay: Mariners F5 -0.5 | Naylor over 1.5 bases | Rodriguez over 0.5 hits (+440)
Mariners F5 -0.5 (-109): Rocker’s home/away splits are about as drastic as you’ll find, and I want to tap into that tonight.
- Home: 2.43 ERA, .203 OBA, 5-0-1 on F5 ML
- Away: 9.91 ERA, .354 OBA, 1-5-1 on F5 ML
The hard-throwing righty has a sixth-percentile xERA (5.52) and 10th percentile xBA (.285). He ceded four runs in 3.1 innings in his lone start in Seattle this year.
Kirby (4.50 ERA) hasn’t been at his best this season, but he’s finding his form at the right time.
He owns a 3.06 ERA in his last six starts — with four quality starts — and a 2.69 FIP. That’s more in line with Kirby’s numbers over the last three years.
Seattle should capitalize on this pitching mismatch at home.
MLB SGP legs
Naylor over 1.5 bases (+145): Naylor profiles as the type of player who can get after Rocker.
- Naylor vs. LHP: .299/.371/.473
- Rocker vs. LHB: .320/.379/.496
Rocker leans heavily on fastballs, throwing either a sinker, cutter or four-seamer 71% of the time.
Naylor is batting .311 and slugging .475 against those offerings from righties in a 409-pitch sample this year. His .312 xBA and .508 xSLG against those pitches are encouraging, too.
This will be the Canadian’s first game as a member of the Mariners at T-Mobile Park, and I’m expecting fireworks.
Rodriguez over 0.5 hits (-240): Finally, I’m looking for J-Rod to record a hit. That shouldn’t be a lot to ask considering the run he’s been on over his past 15 games:
- .323 batting average
- .710 slugging percentage
- 1+ hits in 11 of 15
Rodriguez has five multi-hit games in his last eight outings. He’s also batting .295 against fastballs from righties this year.
Rangers vs. Mariners predictions made at 9 a.m. ET on 07/31/2025.