Darin Mastroianni out six weeks following ankle surgery

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After two injury wrecked seasons the Twins have been remarkably healthy so far, but their lone significant injury has provided a glimpse into the same question health marks that got the head trainer fired this offseason.

Backup outfielder Darin Mastroianni injured his ankle late in spring training, but instead of simply placing him on the disabled list to begin the season the Twins kept him on the active roster. He was too limited to actually do much, but they used him as a pinch-runner and defensive replacement.

Then, after appearing in eight games without logging a single plate appearance, the Twins deemed Mastroianni healthy enough to start two games in center field. Shortly after that he was placed on the DL and diagnosed with a stress reaction in his ankle. Initially the Twins said he’d be out three weeks, but that came and went with Mastroianni still in a walking boot and now he’s expected to miss six more weeks following surgery.

Key detail from Rhett Bollinger of MLB.com: “He initially sustained the injury when he fouled a ball of his ankle in spring training and aggravated the injury while running early in the season.”

Mariners sign Mark Lowe

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The Mariners have signed reliever Mark Lowe, ESPN’s Jerry Crasnick reports. The Tigers released him on Sunday.

Lowe, 33, is entering the last of a two-year, $11 million deal signed with the Tigers in December 2015. The right-hander struggled to a 7.11 ERA with a 49/21 K/BB ratio in 49 1/3 innings last season. His performance this spring didn’t do much to inspire confidence.

Lowe began his major league career with the Mariners, breaking out in 2009 with a 3.26 ERA across 80 innings. He has been inconsistent throughout most of his 11-year big league career, however.

Cardinals place Trevor Rosenthal on DL with lat strain

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The Cardinals announced on Thursday that pitcher Trevor Rosenthal has been placed on the 10-day disabled list with a right lat strain. Sam Tuivailala has been added to the roster in Rosenthal’s place.

The Cardinals’ closer until the second half last year, Rosenthal came into camp this spring hoping to battle for a rotation spot. However, the lat injury killed that dream. When Rosenthal is healthy, he’ll return to the bullpen.

Last season, Rosenthal posted a 4.46 ERA with 14 saves and a 56/29 K/BB ratio in 40 1/3 innings.