Now, Mercer's going to take advantage of the chance to do it again, joining his older brother at Texas State.
The 6-foot-2, 180-pound athlete committed to the Bobcats on Monday night, choosing Texas State over offers from Rice, SMU and McNeese State. He is Texas State's 10th commitment of the Class of 2013.
"I really like the environment at Texas State," Mercer said. "And with my brother being there, I had been leaning that way from the jump. All I hear is good things from him about it. I had a few other choices, but I really want to a chance to play with my brother a few more times before we move on from football."
Mercer, who plays quarterback for La Marque, will join the Bobcats as a wide receiver and wildcat quarterback. Texas State has healthy Houston-area representation on its offense. already with Gaines, Cypress (Texas) Woods product Isaiah Battle and League City (Texas) Clear Springs' Deche Milburn all at receiver, starting quarterback Shaun Rutherford of Bay City (Texas) High School and Angleton (Texas) High School product Terrence Franks (running back) among others.
The energy around the program, the new facilities, including a new football stadium and the fan support that he witnessed on visit helped convince Mercer that San Marcos, Texas is the place for him.
"They have a pretty nice fan base," Mercer said. "It's real supportive. I've been to a couple of home games already and I went to their game (at Houston) and it's a great atmosphere to be around."
Mercer and his La Marque teammates are 6-1 on the season and undefeated in district play through two games. The Cougars, who are ranked no. 5 in the state in Texas' Class 3A, head north to meet Dallas Bishop Lynch on Friday.