The Phillies are breaking in the batter's box at Bright House Field this morning.

After rising prospect Jason Donald worked on infield practice at second base, he joined John Mayberry for some BP. The two right-handers took turns hitting off Phils coach Roly deArmas (the manager and pitching coach for the Gulf Coast League Phillies).

Mayberry is a a big dude. The 25-year-old, acquired in an offseason trade with Texas in exchange for Greg Golson, is an intimidating figure inside the batter's box at 6-foot-5. According to thebaseballcube.com, Mayberry is listed at the same weight as Ryan Howard - 230 pounds - but looks to be slimmer than that.

But he looks like he packs some pop at the plate. The first ball I saw him connect with landed in the bullpen just beyond the left field fence. Mayberry, a former first-round pick like Golson, hit 20 home runs last year in 135 games between Double-A and Triple-A.