COLUMBIA - There was never any doubt South Carolina catcher Grayson Greiner would forego his senior season, but it became official Tuesday.

Greiner agreed to terms with the Detroit Tigers on a contract that includes a $529,400 signing bonus, according to MLB.com. He was a third-round pick by the Tigers in last week's MLB First-Year Player Draft, the 99th overall selection. His signing bonus is the value slotted for his position in the draft.

"It's a dream come true for me," Greiner said. "Ever since I could walk, I dreamed of becoming a professional baseball player. Now I can wake up and put my mind on the field and try to get better."

Greiner had a strong junior season, batting .311 with a team-high 50 RBIs, eight home runs and 13 doubles. He scored 39 runs while starting 58 of his team's 62 games.

Greiner reportedly flew from South Carolina to the Tigers' Spring Training facility in Lakeland, Fla., on Tuesday. He'll be met by former teammate and Gamecocks third baseman Joey Pankake, who was drafted by the Tigers in the seventh round. Pankake has not yet agreed to terms with the Tigers.

"Thanks for the past 21 years, Columbia. See you in a couple of months. #FloridaBound" Greiner tweeted Tuesday morning.