Outfielder/first baseman Corey Hart is back with the Mariners after missing nearly seven weeks because of a strained left hamstring.
The Mariners activated Hart prior to Fridays game against the Chicago White Sox after clearing roster space by designating outfielder Cole Gillespie for assignment.
Hart, 32, tested his recovery by playing 10 games in a rehab assignment at Triple-A Tacoma, where he batted .297 (11-for-37) with five extra-base hits and four RBIs.
The final test came Wednesday when Hart showed no limitations while playing in the outfield for the first time since his injury.
Gillespie, 30, batted .254 with one homer and five RBIs in 34 games after the Mariners selected his contract April 24 from Tacoma, where he batted .362 in 16 games with five homers and 14 RBIs.
Hart suffered the injury May 18 while running the bases in a 6-2 victory at Minnesota. He was batting .209 at the time with five homers and 17 RBIs in 34 games.
The Mariners now have 10 days to trade, release or outright Gillespie off their roster.