Gaedele, 25, the Padres' sixth-round pick in 2011, capped a five-run third inning with his slam. He was 1-for-5 on the night and is hitting .241 on the season.
Rondon, 21, was 2-for-4 with two steals and two runs. He is 19-for-38 over his last 10 games, with two homers, eight RBIs, six steals and 16 runs.
Right fielder Yale Rosen (.220) was 2-for-3 with a RBI.
Right-hander Kyle Lloyd (3-3, 4.14 ERA) allowed two runs on four hits and two walks with nine strikeouts in six innings. Righty Jason Jester (8.68 ERA) allowed a walk with four strikeouts in two scoreless innings.