The Seattle Mariners made corresponding moves involving two pitchers on Thursday, as the team designated left-handed starter Tommy Milone for assignment and selected the contract of right-handed pitcher Isaiah Campbell. The moves come days after the Mariners traded a pair of relievers to the New York Mets.

Milone started two games for the Mariners this season and pitched well in both. He started Wednesday's game against the San Francisco Giants, taking the loss despite allowing only one earned run. He walked four batters and gave up four hits across 4.1 innings. Milone also started a game in April for the Mariners, allowing a run on three hits and two walks in 4.2 innings of work.

Milone likely will not get claimed by another team, meaning the 36-year-old will head back to the minor leagues where he's made 11 starts this season in Triple-A. He has a 3-1 record with a 4.47 ERA in the minors this season.

A little bit of history comes with the call-up of Campbell. He will be the first Portuguese-born player in MLB history once he makes an appearance for the Mariners. He was originally slated to start Thursday's game but Seattle has since shifted to George Kirby for the start.

Campbell has been nothing short of brilliant in the minors since being drafted by the Mariners in 2019. He has a 2.01 ERA in 61 games dating back to 2021. This season Campbell has a 2.63 ERA in 23 relief appearances, adding 27 strikeouts and five saves.

The Mariners are a disappointment this season after breaking a 20-year playoff draught in 2022. Seattle sits five games out of a playoff spot as the All-Star break looms.

More Seattle Mariners News
Seattle Mariners catcher Cal Raleigh (29) swats away sunflower seeds thrown by a teammate in the dugout after hitting a solo-home run against the Kansas City Royals during the seventh inning at T-Mobile Park.
Mariners star Cal Raleigh’s hilarious reason why All-Star process was ‘uncomfortable’Miguel La Torre ·
Seattle Mariners outfielder Randy Arozarena (56) is hit by a pitch during the third inning against the Chicago White Sox at Rate Field.
Mariners’ Randy Arozarena continues hot streak with solo blast vs. RoyalsAbdullah Imran ·
Seattle Mariners catcher Cal Raleigh (29) hits a solo home run in the seventh inning against the Cincinnati Reds at Great American Ball Park.
Mariners’ Cal Raleigh joins elite company after 33rd home runJosh Davis ·
Jun 13, 2025; Seattle, Washington, USA; Seattle Mariners left fielder Randy Arozarena (56) tosses his bat after walking against Cleveland Guardians during the first inning at T-Mobile Park. Mandatory Credit: Steven Bisig-Imagn Images
Randy Arozarena hits career milestone with HR vs. RoyalsMike Gianakos ·
Seattle Mariners third baseman Miles Mastrobuoni (21) reacts after hitting an rbi single during the twelfth inning against the Texas Rangers at Globe Life Field.
Mariners’ Miles Mastrobuoni extends Seattle-Rangers marathon with insane sliding grabJosh Davis ·
Seattle Mariners catcher Cal Raleigh (29) hits a double against the Minnesota Twins in the first inning at Target Field
Mariners’ Cal Raleigh makes HR Derby decision amid monster campaignAlex House ·