Pinch-hitter Garrett Jones then drew a walk and pinch-runner Nate McLouth went to second on Belisle's fielding error. He advanced to third on an out and trotted home when McGehee served a pitch into right field for an RBI.
The hit made a winner of Tony Watson (1-0), who earned the victory despite allowing a go-ahead, two-run homer to Carlos Gonzalez in the top of the eighth -- the Colorado outfielder's second two-run blast of the game.
Joel Hanrahan picked up his third save with a 1-2-3 ninth as the Bucs claimed the opener of four-game series following a Monday rainout.
Forty-nine-year-old Jamie Moyer pitched well for the Rockies, yielding only one run on six hits over a six-inning start.
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