A's prospect Michael Ynoa to undergo Tommy John surgery

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Michael Ynoa almost immediately had arm problems after the A’s signed him out of the Dominican Republic as a 16-year-old for an international record $4.25 million in 2008 and today the team announced that he’ll undergo Tommy John elbow surgery.
Ynoa has appeared in just three pro games, all this season, tossing nine innings with a 5.00 ERA and 11/4 K/BB ratio at rookie-ball. His fastball was clocked in the mid-90s before he was shut down, but now he’ll miss most and perhaps all of next season.
Of course, he’s so young that even missing all of next season would leave Ynoa coming back in 2012 as a 20-year-old. Interestingly, as Ben Badler of Baseball America notes the A’s will need to protect Ynoa from the Rule 5 draft by placing him on the 40-man roster after the 2012 season, at which point he’ll likely still be at Single-A.

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.