Burriss moved from second base to third on a routine fly ball to left, then scored the winning run on a wild pitch in the bottom of the ninth inning to give the Giants a 4-3 victory over the Florida Marlins 4-3 on Thursday.
"You have to stay aggressive," Burriss said. "The second you second-guess yourself is when things start to cause problems. We have our ups and downs when it comes to being aggressive but it's part of the learning process."
During a Giants loss at Atlanta on Sunday, Burriss was cut down trying to steal third after hitting a one-out double in the first. That killed San Francisco's scoring threat and earned Burriss a visit with Giants manager Bruce Bochy, who told his young infielder to stay aggressive but be more selective.
Burriss got the point.
He drew a one-out walk off Marlins closer Kevin Gregg to start the winning rally, stole second, and took third on Randy Winn's fly out to left. After pinch-hitter Bengie Molina was intentionally walked, Gregg's second pitch to Fred Lewis skipped past catcher John Baker, allowing Burriss to score standing up.
"It's one of those things where if it works you get praised for it and if it doesn't ... you look like the dumb rookie," Burriss said of his decision to move to third on Winn's fly ball. "It wasn't really a risky play when it comes to ending the inning. I figured the closer I could get to home plate the better off the team would be."
Brian Wilson (2-2) pitched a scoreless ninth for San Francisco, which won for the fourth time in five games. Wilson got the win Wednesday, too, when the Giants also beat the Marlins in the final inning.
San Francisco improved to 19-13 against the NL East, the only division the Giants have a winning record against this season.
After struggling at home for most of the season, San Francisco won for the sixth time in nine games at the club's waterfront ballpark.
"We're finding ways to win," Giants manager Bruce Bochy said. "More than anything, we're throwing the ball better. We're pitching better here at home and that's a big part of it."
Dan Uggla hit his 27th home run for Florida in the second but cost the Marlins another run when he ran through the stop sign of third base coach Bo Porter. He was thrown out easily at the plate while trying to score on Josh Willingham's double in the fourth.
"We just couldn't break it open, and when that happens you put pressure on your defense, put pressure on your pitching and bad things can happen," Florida manager Fredi Gonzalez said. "They got some guys on the bases and made stuff happen. We tried to do the same thing but couldn't get that hit."
Gregg (6-6) took the loss for the second time in three appearances.
The Marlins lost their second straight to San Francisco and dropped to 7-12 in August while falling farther behind the Mets and Phillies in the NL East.
"We can't think about that," Gregg said. "We've got to get ourselves back on the winning track right now and do whatever it takes to win ballgames. We can't worry about what they're doing or how it puts us in the standings. We've got to win."
The Giants trailed 2-0 when Pablo Sandoval singled, took second on a groundout and scored on Eugenio Velez's RBI single in the fourth. Ryan Rohlinger's triple to right-center scored Velez, but he was later thrown out at the plate when Palmer missed on a squeeze bunt attempt.
Giants starter Matt Palmer pitched effectively, allowing two runs and six hits over six innings, but was denied his first career victory when San Francisco's bullpen failed to hold the lead. The right-hander, who gave up six runs in 2 1/3 innings in his major league debut against Atlanta on Saturday, lowered his ERA from 23.14 to 8.64.
Florida's Josh Johnson also worked six innings and left after being tagged for nine hits and three runs. The Marlins won each of the first six games Johnson started this season but have lost in his last two appearances.
Palmer recorded his first major league hit with a single off Johnson in the third. ... During the game Comcast broadcast a short tribute to American beach volleyball gold medalist Misty May-Treanor, wife of Florida catcher Matt Treanor.