Hirano allowed two runs on three hits and a walk while striking out a batter in the ninth as he picked up his fourth save of the season Wednesday against the Astros.
Hirano struck out one in a scoreless seventh inning to record his second save of the season during a 6-5 win over the A's in the first game of Monday's doubleheader.
Hirano allowed a solo homer in the ninth inning Sunday but still earned the save against the Rangers. He struck out three batters.
Hirano, who's logged four relief appearances since his delayed season debut, is the likeliest candidate to see the majority of save chances the majority of the season with the trade of Taylor Williams to the Padres on Monday.
Hirano was credited with his first hold of the season in a win over the Padres on Tuesday, firing a scoreless sixth inning during which he allowed no hits and one walk.
Hirano, activated from the injured list Friday, fired a scoreless ninth inning in a win over the Rangers on Saturday, recording two strikeouts.
HIrano (illness) was reinstated from the injured list Friday.
Hirano (illness) has been throwing at the Mariners' alternate training site in Tacoma over the past week and may face live hitters as soon as this weekend, Greg Johns of MLB.com reports.
Hirano (illness) joined the team at the alternate training site Friday, Greg Johns of MLB.com reports.
Hirano (illness) is close to being ready to face live hitters at the Mariners' alternate training site in Tacoma, Greg Johns of MLB.com reports.