Jannis pitched to a 2.98 ERA in eight games (seven starts) for St. Lucie after signing out of the independent Atlantic League. The 27-year old also made one start at Double-A Binghamton, allowing three runs in 5 1/3 innings. He was a 44th-round selection of Tampa Bay in 2010.
New York signed Wheeler as a free agent in 2011 out of the University of California, Santa Barbara. The 26-year old is 5-1 with a 3.69 ERA in 40 relief appearances for Binghamton this season.
Players from the Mets, Blue Jays, D-Backs, Nationals and Rockies will combine to form the Salt River Rafters, who play their games in Scottsdale, Ariz,.