The Giants took the lead in the top of the final frame by scoring four runs, but after Shawn O'Malley reached first on a single, Calhoun brought him in with a timely homer to win the game.
Chris Dominguez went 2-for-2 and Ryan Lollis' triple drove in two runs for the Giants. Tim Lincecum was reached for five runs on seven hits in 5 1/3 frames.
Former Titans kicker dies in car crash
UPI Sports Results for September 20, 2014