The Mariners have activated third baseman Kyle Seager from the 60-day injured list, per a team announcement on Saturday. Dylan Moore has been optioned to Triple-A Tacoma to clear a spot on the 40-man roster for Seager, while right-handed reliever Sam Tuivailala has been placed on the 60-day IL (ruptured Achilles tendon).

Seager, 31, suffered a partial tear in the extensor tendon of his left hand during spring training and has yet to make his season debut. He underwent surgery on the tendon in mid-March and has had a long and slow recovery since then, eventually working his way up to a few starts in Triple-A last week. Through his first nine games in the minors, he batted .256/.310/.308 with two extra bases, seven RBI, and a .617 OPS over 42 plate appearances.

Any progress is good progress, though, and the Mariners will no doubt be looking to Seager to uphold the .250+ average, 3.0+ fWAR totals of seasons past as he works his way back to a full workload — especially with fellow third baseman Ryon Healy headed to the 10-day IL with a bout of back inflammation. Seager will start at third and bat sixth when the club faces off against the Athletics at 4:07 PM EDT on Saturday.