SEATTLE — The Mariners added a veteran arm to their bullpen Thursday, agreeing to a $1.6 million, one-year contract with Yoshihisa Hirano.
Seattle also agreed to a minor league contract with left-hander Wei-Yin Chen, a deal subject to a successful physical.
Hirano has spent the past two seasons with the Arizona Diamondbacks, appearing in 137 games with a 3.47 ERA. Hirano was very good in 2018 when he struck out 69 batters in 66 1/3 innings and allowed just 18 earned runs. He struggled last season while appearing in 62 games. He had a 4.75 ERA and issued 22 walks in 53 innings.
Before joining the Diamondbacks, the 35-year-old Hirano spent 11 seasons pitching in Japan for Orix of Japan’s Pacific League.
“We believe his combination of experience and bat-missing ability brings needed stability to our bullpen,” Seattle general manager Jerry Dipoto said in a statement.
Hirano can earn $500,000 in bonuses based on pitching appearances: $50,000 each for 30 and 35, $75,000 apiece for 45 and 50, $100,000 for 55 and $150,000 for 60.
He also can get $450,000 in bonuses for games finished: $50,000 for 20, $75,000 apiece for 25 and 30, $100,000 for 35 and $150,000 for 40.
Hirano would receive a…