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Seattle Mariners probable pitchers & starting lineups vs. Boston Red Sox, April 22

The Mariners ride a hot streak into Boston, where they'll face a tough Red Sox team.
ByZachary Rymer|
Seattle Mariners catcher Cal Raleigh (29) and pitcher Andrés Muñoz (75) celebrate a win after the 10th inning of the MLB Interleague game between the Cincinnati Reds and the Seattle Mariners at Great American Ball Park in downtown Cincinnati on Thursday, April 17, 2025. The Mariners beat the Reds, 11-7, in 10 innings.
Seattle Mariners catcher Cal Raleigh (29) and pitcher Andrés Muñoz (75) celebrate a win after the 10th inning of the MLB Interleague game between the Cincinnati Reds and the Seattle Mariners at Great American Ball Park in downtown Cincinnati on Thursday, April 17, 2025. The Mariners beat the Reds, 11-7, in 10 innings. | Sam Greene/The Enquirer / USA TODAY NETWORK via Imagn Images

The Seattle Mariners began their current nine-game road trip with questions aplenty about their ability to succeed away from T-Mobile Park. A 4-2 run through Cincinnati and Toronto has changed that, and now the Mariners will look to close things out in style.

On Tuesday, they'll begin a three-game series against the Boston Red Sox at Fenway Park. Seattle (12-10) and Boston (12-11) are right next to each other in the American League standings, and both are playing good baseball.

The M's have won nine out of 12, and their last 10 have seen the offense average 1.9 home runs and 6.1 runs per game. Nobody is hotter than Cal Raleigh, who co-leads the majors with nine homers.

The Red Sox have won five out of six in their own right, and are set to welcome back a key pitcher on Tuesday. Here's a look at the likely pitching matchup and lineups and how to tune in, with first pitch at Fenway Park scheduled for 3:45 p.m. PT.

Starting Pitchers

For the Mariners: Bryce Miller, RHP (1-3, 3.43 ERA)

Miller had issues in his first three starts of 2025, notably struggling with his velocity as he battled soreness in his right arm. But last Wednesday against the Reds, he managed to bounce back nicely.

The 26-year-old struck out eight over five scoreless innings, sitting at 95.4 mph with his fastball after working at 93.9 mph in his previous outing. He got four strikeouts on the fastball, doubling the number he had gotten on it in his first three outings combined.

Apart from the four-seamer, expect Miller to rely heavily on his sinker and knuckle-curve with the occasional splitter, slider and sweeper. And the more he can ramp up the velo, the better. The Red Sox have struggled against 95-plus heat so far in 2025.

For the Red Sox: Brayan Bello, RHP

After sitting for the first few weeks of the 2025 season with inflammation in his right shoulder, Bello is set to make his debut against the Mariners on Tuesday.

He posted a 7.07 ERA during a four-start rehab assignment, but that came with 21 strikeouts over 14 innings. He got up to 98.3 mph with his sinker. In addition to that pitch, Mariners hitters will have to be ready for a slider and changeup from Bello.

Bello typically struggles against left-handers, who have a .828 OPS against him for his career. That's a cue for Raleigh to do damage, though Jorge Polanco, Luke Raley, and Rowdy Tellez are welcome to join in as well.

Mariners Starting Lineup vs. Bello

  1. CF Julio Rodríguez (R)
  2. DH Jorge Polanco (S)
  3. C Cal Raleigh (S)
  4. LF Randy Arozarena (R)
  5. RF Luke Raley (L)
  6. 1B Rowdy Tellez (L)
  7. 2B Dylan Moore (R)
  8. 3B Miles Mastrobuoni (L)
  9. SS J.P. Crawford (L)

Red Sox Lineup vs. Miller

  1. LF Jarren Duran (L)
  2. DH Rafael Devers (L)
  3. 3B Alex Bregman (R)
  4. SS Trevor Story (R)
  5. RF Wilyer Abreu (L)
  6. 2B Kristian Campbell (R)
  7. 1B Triston Casas (L)
  8. C Carlos Narváez (R)
  9. CF Ceddanne Rafaela (R)

How can I watch the Mariners today?

Regional Coverage

  • Washington, Oregon, Idaho, Montana, Alaska: The game will be televised on ROOT Sports Northwest.​
  • New England outside of Fairfield County, Connecticut: The game will be televised on NESN.

Satellite Coverage

  • Nationwide: Available via DirectTV.

Radio Broadcast

  • Seattle Region: Tune in to Seattle Sports 710 AM or stream the audio live at seattlesports.com.​
  • New England Region: Tune in to WEEI 93.7 or stream the audio live at audacy.com/weei.

Streaming Options

  • ROOT Sports Streaming App: Fans in Washington, Oregon, Idaho, Montana, and Alaska can stream the game live through the ROOT Sports streaming service
  • FuboTV: Subscribers in the aforementioned regions can also stream the game live via FuboTV, which carries ROOT Sports Northwest.
  • MLB.TV: Out-of-market viewers can watch the game live with an MLB.TV (subscription required).

What's at Stake?

For the Mariners, the goal is simple: stay hot.

Their 9-3 run has pushed them two games over .500 and to within a game of the Texas Rangers for the AL West lead. If they keep rolling in this series, there is a very good chance that they'll return to Seattle atop the division.

There is nonetheless a lingering sense that the Mariners offense has been a little too good of late. It's nice to see so many runs on the board, but they can't count on surprise contributors like Tellez and Dylan Moore forever. More than anything, what Seattle needs is for Rodríguez to go out there and have a breakout series. He's batting just .188 with a .675 OPS.

To this end, perhaps three chances to take aim at the Green Monster is just what J-Rod needs.

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