In camp as a non-roster invitee, Petersen was in the mix for a reserve spot. A left-handed hitter, he plays all three outfield positions.
Petersen appeared in 15 Grapefruit League games, and he was 1-for-16.
The biggest hit he had, which isn't included in his official Grapefruit League stats because it came in an exhibition against Team Venezuela, was March 5 at Roger Dean Stadium. In the tune-up for the World Baseball Classic, Petersen delivered a walk-off triple.
Miami's toughest competition is in center field, where Justin Ruggiano, Chris Coghlan and Gorkys Hernandez are in the mix. The team is expected to keep two of the three.
Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter