Giants rookie Victor Bericoto had played sparingly ever since he was promoted to the big leagues on May 22. But the 24-year-old Venezuelan certainly made his impact felt when he got a rare start in left field on Wednesday night. Back in the starting lineup for the first time in two weeks, Bericoto delivered a walk-off home run off A’s right-hander Elvis Alvarado with two outs in the bottom of the ninth inning to lead the Giants to a dramatic 2-1 comeback win over the A’s at Oracle Park. The Giants entered the bottom of the ninth trailing, 1-0, but they finally managed to get on the board after Rafael Devers led off the inning with a game-tying shot off Alvarado. The game looked like it might be heading for extra innings after Alvarado came back to retire Willy Adames and Jung Hoo Lee, but Bericoto had other plans. Bericoto drove a misplaced slider from Alvarado 445 feet out to left-center field for his first career walk-off home run, helping the Giants clinch their first series win at home since May 22-24 against the White Sox. It was a no-doubt shot from Bericoto, who took a second to admire his game-winning blast before tossing his bat and beginning his memorable trip around the bases. "I want to thank the manager for having faith in me and giving me the opportunity to start today,” Bericoto said in a postgame interview with NBC Sports Bay Area. “Every time I show up to the ballpark, I get ready as if I'm going to start, so I'm very happy to be able to get the opportunity to play today."