Injuries piling up for Seattle Mariners' pitching staff as Hisashi Iwakuma is placed on DL

Right-hander Hisashi Iwakuma joined three other Seattle Mariners' starting pitchers on the disabled list Wednesday.

Iwakuma, 36, will be sidelined with right shoulder inflammation. He joins Felix Hernandez (shoulder), Drew Smyly (flexor tendon) and James Paxton (forearm strain) on the DL, leaving right-hander Yovani Gallardo as the only starter from the Opening Day rotation.

Right-hander Sam Gaviglio was recalled from Triple-A Tacoma to fill the vacant spot on the 25-man roster. He is 2-3 with a 3.31 ERA in five minor league starts this season.

Iwakuma is 0-2 with a 4.35 ERA in six starts. The move to the the disabled list is retroactive to May 4.