Iwakuma has spent the season recovering from shoulder surgery. He plans to return to Japan and try to pitch in Nippon Professional Baseball.

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While his teammates — all of them likely unaware of his decision — conversed/yelled in the Mariners clubhouse before Tuesday’s game at loud decibels to overcome the blaring music already playing, Hisashi Iwakuma stood quietly at his locker with his translator Antony Suzuki ready to discuss the end of his time with the Seattle Mariners and Major League Baseball.

After another season of starts, stops and setbacks in trying to return from offseason shoulder surgery, time ran out on Iwakuma and his chances to help the Mariners in 2018. And he knows that his best chance to pitch again in 2019 won’t be in a Mariners uniform.

“Looking at the big picture, it’s been long process of rehab, and finally in this long tunnel, I’m starting to see light,” he said though Suzuki. “And at this point, it’s unfortunate that I cannot come back as a Mariner. But Japan is my origin. It’s where I started my career, and by saying that, I think it’s a good place to end my career too. With that said, I wanted to explore how much more I could do back in Japan and see if there any teams are interested in me.”

The Mariners brought back Iwakuma on a minor league contract this season, hoping he could recover from the surgery and help out the pitching staff in the second half of the season. Despite Iwakuma’s tireless work ethic and hours upon hours of diligent strengthening, throwing and rehab, he never could make it happen. He got close multiple times but experienced setbacks when throwing in live batting practice sessions. He made his way back to pitch in two rehab starts — a total of three innings — for short-season Everett. But it wasn’t viable for a return to the big leagues.

“Kuma has done everything he could do to try and get back and help us,” manager Scott Servais said. “Unfortunately, he’s not going to pitch for us this year. I know he wants to continue to play. He’s awesome. I wish that injuries didn’t happen, unfortunately they do. I think he saw enough out of his last outing or two that he still feels like he wants to continue to play, which is a good thing.”

In seven seasons with the Mariners, Iwakuma made 136 starts and 14 relief appearances, posting a 63-39 record with a 3.42 ERA. He struck out 714 batters and walked 184 in 883 2/3 innings pitched. He also tossed the organization’s fifth no-hitter in 2015.

“Kuma is a warrior,” Servais said. “That’s my best way to put it. He will come into a ball and it will be the first or second inning and you are thinking, ‘Oh my gosh, he doesn’t have much today. How is he going to get through this?’ And he figures out a way. It’s his ability, his feel to pitch, to maneuver through a lineup, to get out of trouble, to make pitches when he has to. When his back’s against the wall, Kuma can really pitch. That’s what I remember from him. I loved giving him the ball. I loved his competitiveness. I think he has a lot of respect from the guys he played with.”

After agreeing to a three-year free agent contract with the Dodgers before the 2016 season, Iwakuma failed his physical. When the Dodgers tried to restructure the deal, Iwakuma opted for a one-year incentive-laden contract to return to the Mariners. He’s never pitched for any other MLB team in his career. It’s something that he takes pride in.

“This is the city that I played for seven years and this is the only city I lived in,” he said. “It’s by far the best city I can think of. The city has treated me well. The fans have treated me great. This organization — we have done a lot of work here and without their help I wouldn’t have come this far and at late age for myself. I only have good memories here. It’s unfortunate that I have to leave, but it is what it is. I’m leaving on good terms. I’m very fortunate.”

After a standout career with the Rakuten Golden Eagles in NPB, Iwakuma’s player rights were awarded to Oakland in the previous posting system after the 2010 season. However, Iwakuma and his agent couldn’t reach an agreement with the A’s in the 30 day window. He returned to Rakuten for the 2011 season, missing a good portion of the season with shoulder issues.

Iwakuma signed with the Mariners after the 2011 season for just $1.5 million in a heavily incentive-laden contract. After pitching in relief to adjust to MLB’s pitching schedule and giving his shoulder time to recover, he put together a solid season, posting a 9-5 record with a 3.16 ERA in 14 relief appearances and 16 starts. The Mariners signed him to a three-year contract extension after the season.

He had a marvelous 2013 season, posting a 14-6 record with a 2.33 ERA while being selected to the American League All-Star honors and finishing third in Cy Young voting.

As he progressed into his mid-30s, Iwakuma dealt with injury issues each season, but proved to be effective when healthy. But after posting a 16-12 record with a 4.12 ERA in 33 starts in 2016, he developed shoulder issues the following season. Iwakuma pitched in just six games before going on the disabled list on May 10. He tried multiple comebacks, but never pitched in another MLB game that season. He eventually had surgery to clean up the shoulder in September.

“Kuma is never going to be one of those players that looks back and says, ‘I wish I would have done that,'” Servais said. “He’s exhausting all things, whether it’s the stretching the strength training, the cardio, the throwing program, the bullpens, the video, everything. Kuma has really taken it another level. He’s a great example for our younger guys. There’s no question about that.”

Looking back, Iwakuma admitted he’d exceeded his and most people’s expectations when he first arrived in the U.S.

“It’s hard to describe it into words,” he said. “It’s obviously more than I ever expected. It’s a very tough league to compete in. I knew I came here for that challenge.  It worked out very well. Being able to wear a Mariners jersey for seven years has been very special.”