The Marlins recalled Mattison and left-hander Mike Dunn from Triple-A New Orleans and sent down relievers Sandy Rosario and Chris Hatcher prior to the start of the home series against the Mets. The move gives the Marlins 13 position players and 12 pitchers on the 25-man active roster.
Mattison, a native of South Florida who lived in Royal Palm Beach until he was 12, was called up for the first time, and got the call from Triple-A manager Ron Hassey while on a midnight Taco Bell run with his roommates in New Orleans.
"I couldn't believe it," Mattison said. "I could believe it, but I couldn't believe it at the same time. It's something you always want to do, but the chances of it actually happening are pretty slim to none."
Mattison was hitting .250 with seven doubles, three homers and 13 RBIs in 31 games with New Orleans. He also had five stolen bases in 11 attempts. His speed is a big reason for the callup, as he is regarded as the fastest center-field prospect in the organization. He is expected to serve as a late-game defensive replacement who can also pinch-run when necessary.
"I'm here to help the team win any way I can, and if that's my role, that's my role," he said. "I'm going to go out there and play the best defense I can, it doesn't matter what position; same with baserunning."
Whereas Mattison gives the Marlins' previously short bench some depth, Dunn provides another left-handed reliever out of the bullpen to complement Randy Choate. Dunn led Marlins relievers in appearances last season but struggled this season before being optioned to the Zephyrs on April 29.
"I just went down there and tried to get into a groove, and find myself again," Dunn said. "I think I was trying to create way too much instead of just pitch. It's not like my numbers were outstanding or anything down there either. But my last two games, I threw the ball really well. I got my rhythm back and just kind of got into that groove. Just being me."