Hagelston signed a letter of intent to play baseball for the Jaguars on Thursday.
Hagelston, a senior right-handed pitcher, helped lead Westside to a Region 3-AA title and third-round appearance in the 2012 state playoffs.
The 6-foot-4 Hagelston will now attempt one more run with the Patriots before helping revive the Georgia Regents program under new coach Jason Eller, who was formerly an assistant at Georgia.
“I chose GRU because I feel it’s the right fit for me,” Hagelston said. “(Eller) is a real good guy. He’s easy to get along with and you understand him. He knows what he’s doing.”
Hagelston was Westside’s No. 1 starter throughout the 2013 season, including the playoffs, where he struck out nine against Metter in the first round. He allowed just one run in the second round against Lamar County.
Hagelston has experience in summer leagues, participating in Perfect Game’s World Wood Bat Association tournament in Marietta, Ga., in July. His fastball was clocked at 87 miles per hour during this year’s tournament.
“David has been a good player for us,” Westside coach Gerald Barnes said. “He came in and was able to play early. He’s been a good pitcher, very consistent, and a good kid.”