As a sophomore, the 6-foot-3, 215-pound backstop sustained an ankle fracture and broken fibula during practice early in the 2012 season. Haynal underwent two surgeries and had no choice but to declare a redshirt for the rest of the year.
When he returned to action in 2013, Haynal hit .240 in 44 games.
But he came back for a 2014 season that saw him put up better numbers across the board. Haynal finished at .312 with 12 homers and 49 RBI, and his .576 slugging percentage was the 47th-best in the country.
The Marlins aren't worried about Haynal's mobility behind the plate. He made three errors all season and threw out 45 percent of potential base stealers.
"He moved around fine, he blocked fine and he showed us lateral quickness behind the plate, which in our mind meant he was healthy," said Stan Meek, Marlins vice president of scouting. "He played most of the time, so we didn't see anything physically from him that would cause us any concern."
The Marlins drafted Haynal's teammate, senior righty reliever Justin Hepner, in the 36th round.
Maria Torres is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.