Volstad (7-9) struck out two and walked four while the Padres, who have lost five of six games since the All-Star break, mustered only single runs in the first and ninth innings.
Leo Nunez picked up his sixth save despite serving up a solo home run to Kyle Blanks leading off the ninth.
Hanley Ramirez had three hits for the Marlins, and John Baker had two.
Chad Gaudin (4-9) took the loss on three runs and nine hits in six innings.
San Diego scored a run in the bottom of the first on an RBI single by Adrian Gonzalez.
Florida came back with a run in the second on Baker's RBI double, then took the lead in the third on a single by Chris Coaghlan and an RBI single by Jorge Cantu.
The Marlins scored their third run in the fifth when Emilo Bonafacio singled, moved to third on a base hit by Cantu, then scored on a sacrifice fly by Jeremy Hermida.
Copyright 2009 by United Press International.
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