Hart was placed on the 15-day DL on Saturday with a bruised right knee, Greg Johns of MLB.com reports.

Hart's knees have surprisingly held up to this point, but he will require a couple weeks to recover after suffering a contusion. His placement on the DL conveniently opens up a roster spot for James Paxton (back), Saturday's starter against the Orioles, and will allow Kendrys Morales to move back over to DH full-time with Logan Morrison at first. Deadline acquisition Chris Denorfia will take on a regular role in right field.

Corey Hart went 0-for-3 with a sacrifice fly in his return from the disabled list Friday.

Hart's ninth inning sac fly was the M's only offense of the night against Chris Sale. The 32-year-old missed six weeks with a hamstring strain, but the Mariners are hoping he can add some pop to what is a predominantly left-handed lineup.

Mariners activated 1B/OF Corey Hart from the 15-day disabled list.

Hart has been on the shelf since mid-May with a left hamstring strain, but he was cleared to return to action after batting .297/.366/.514 with one homer over 10 rehab games. He hit just .209/.295/.353 across 37 contests before going on the DL but did homer five times while driving in 17 runs.

Corey Hart (hamstring) will begin a rehab assignment with Triple-A Tacoma on Saturday.

He should only need a handful of rehab games, putting him in line for a return sometime next week. Hart, who has missed the last month with a strained left hamstring, was batting just .209 with a .647 OPS before going down with the injury.

Corey Hart (hamstring) ran the bases Monday.

Hart began baseball activities over the weekend and is expected to start a rehab assignment later this week. He's been on the shelf since mid-May with a left hamstring strain but is on track to return to action before the end of the month.

Corey Hart (hamstring) will take batting practice for the first time on Friday since straining his hamstring on May 19.

He'll progress to doing some light running on the field on Saturday, as he continues to work his way back towards a return to the Mariners lineup. If all goes well, he could be cleared for a minor league rehab assignment in a week or so, and be looking at a return to the lineup in late-June.

Corey Hart (hamstring) was given a platlet-rich plasma (PRP) injection on Monday.

Hart won't be allowed to begin activities for another week. He's expected to be out until at least mid-June with a Grade 2 left hamstring strain.

Corey Hart (hamstring) is expected to miss 4-6 weeks.

Hart suffered a Grade 2 left hamstring strain on Sunday and was placed on the 15-day disabled list Tuesday afternoon. The veteran outfielder was batting just .209 with a .647 OPS this season for the Mariners, but he did have five home runs and 17 RBI in 37 games. That power will be dearly missed in the Seattle lineup.

Mariners placed OF/DH Corey Hart on the 15-day disabled list, retroactive to May 19, with a left hamstring strain.

The Mariners have called up Nick Franklin in a corresponding roster move. Hart is dealing with a Grade 2 strain of his left hamstring and might not be ready when he's first eligible.

Corey Hart has been diagnosed with a strained left hamstring and will be re-evaluated on Monday.

Hart injured the hamstring while stealing second base during Sunday's game. The Mariners don't play again until Tuesday night, so any potential roster move involving Hart might not happen for a while.

Corey Hart left Sunday's game against the Twins with an apparent hamstring injury.

Hart appeared to tweak his hammy on a stolen base in the fourth inning. He immediately came off the field, not even waiting for the Mariners' trainer to check on him. The M's should update Hart's status before long.

Corey Hart had a brutal night at the dish in Friday's loss to the Twins, going 0-for-5 with a pair of strikeouts.

Hart also left five runners on base, including a pop out with the tying run at third base with one out in the ninth inning. The rough night leaves him hitting just .209/.293/.351 on the season.

Corey Hart went 2-for-4 with two doubles in Sunday's loss to the Marlins.

Hart scored the Mariners' first run of the game following the double, and he was replaced for a pinch-runner after leading off the ninth inning with another two-base hit. The right fielder is hitting .269 in his first three weeks of action after missing all of 2013 with knee injuries.

Corey Hart is playing right field for the first time with the Mariners Thursday afternoon vs. the Rangers.

Hart missed the entire 2013 season after undergoing dual knee surgeries, so he has been limited to DH duties in his 10 starts so far with Seattle. The 32-year-old has displayed good power in the early going, boasting three home runs in 43 plate appearances.

Corey Hart blasted two home runs in Tuesday's 5-3 victory over the Angels.

Hart erased Seattle's 3-1 deficit with a two-out blast in the third inning off Hector Santiago. Hart's solo seventh inning round-tripper against Fernando Salas was a tattooed line drive right down broadway and over Mike Trout's head in center. The 6-foot-6, 230-pounder has been all-or-nothing at the dish so far this season, bopping three homers and two singles over 22 at-bats for a .227 average and .636 slugging percentage.

Corey Hart is not in the starting lineup for the Mariners season opener against the Angels on Monday.

Manager Lloyd McClendon announced Sunday that the veteran outfielder will be spotted against left-handers early in the season, and will DH in the team's next two games.

Corey Hart (forearm, back) is scheduled to play in the Mariners' final spring training game on Saturday.

Hart responded well to playing in minor league games Wednesday and Thursday and will play in another one Friday. The fact that he's in line to play a big league game Saturday should rule out any chances that he might need a disabled list stint. That's provided that he doesn't have a setback, of course.

Corey Hart (forearm, back) is scheduled to play in minor league games on Wednesday and Thursday.

Hart is hoping to be over his back tightness and forearm tenderness by the start of the regular season, but he might be ticketed for the 15-day disabled list no matter what. The 32-year-old missed the entire 2013 season and is 5-for-35 (.143) with 18 strikeouts this spring in the Cactus League. The Mariners want to use him as their primary DH and part-time corner outfielder this season.

Mariners skipper Lloyd McClendon said Corey Hart (forearm, back) will get most of his early-season at-bats at DH.

We can extrapolate a few other projections from this pronouncement: 1.) The odds of a Kendrys Morales return to Seattle appear to be just about zero, 2.) Abraham Almonte should garner the bulk of CF at-bats, with Michael Saunders spelling him, and, 3.) Saunders will join Stefen Romero and Logan Morrison in a free-for-all for RF at-bats. Playing Morrison in the outfield is ill-advised, but roster construction from above really doesn't afford McClendon much choice unless Hart is on the DL or Justin Smoak is benched.

Corey Hart (forearm, back) is out of the lineup for the third consecutive day on Sunday.

Hart's body has been subjected to a surgeon's scalpel numerous times in his life, and his surgically-repaired knees need some acclimation time after resting for the duration of the 2013 campaign, but this is discouraging news eight days out from Opening Day. Hart, who signed a one-year, $5 million free agent contract with the Mariners in mid-December, should have an attractive back-date if Seattle decides to begin his season on the DL.