Brad Mills - USA TODAY Sports

Nick Pivetta will rejoin the Phillies, while Brock Stassi heads for Double-A Reading to make room on the roster.

With Nick Pivetta coming into the rotation to take Vince Velasquez spot, the Phillies had to open a spot on the roster. The odd-man-out was Brock Stassi, who was optioned out to Double-A Reading.

In a move that surprised most observers, Brock Stassi was optioned to Double-A Reading to make room on the 25-man roster for Nick Pivetta. The Phillies have Rhys Hoskins playing first base at Triple-A Lehigh Valley, necessitating sending Stassi down to Double-A. 

Manager Pete Mackanin stressed the need for Stassi to get constant at-bats rather than having to split time with Hoskins, who the Phillies also want to have regular playing time with the IronPigs.

Stassi was a long-shot to make the team out of Spring Training, with one of the reasons for him not making the team being that he would benefit more by playing everyday in the minors. Stassi played in 39 games with the Phillies, getting just 61 at-bats and batting .197 with two home runs and six RBI on the season.

Pivetta takes the rotation spot exited by Vince Velasquez, who is on the 10-day DL with a right flexor strain. The Phillies hope to be able to have Velasquez rehab the elbow after some time off and return to the team around the all-star break. Pivetta has been up with the Phillies earlier this season, making five starts and going 1-2 with a 5.18 ERA in the majors. At Lehigh Valley, Pivetta was 5-0 with a 1.41 ERA in five starts this season.

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