Padres manager is under contract for 2015.
Buster Posey and Adam Duvall homered, and the Giants geared up for the NL wild-card game by beating the Padres 9-3.
Brandon Crawford hit a two-run single with two outs in the eighth inning.
It was San Diego's 48th home win, setting the franchise single-season record at Petco Park, which opened in 2004.
Eric Stults pitched effectively into the seventh inning and the San Diego Padres won their fifth straight game.
The Giants lost 8-2 to the Padres on Sunday to fall 4 1/2 games behind the Los Angeles Dodgers in the NL West race.
Andrew Cashner pitched brilliantly into the ninth inning.
Tim Hudson allowed four runs in the first inning and the San Francisco Giants were held to three hits in a 5-0 loss to San Diego.
Alexi Amarista had three hits, including a go-ahead two-run homer, to lead the Padres to a 5-4 win over the Philadelphia Phillies.
Padres scored only run of game on Philadelphia error.
Nolan Arenado homered and Franklin Morales pitched six solid innings for his first win in two months.
Cory Spangenberg's first big league home run came on the first pitch he saw as a pinch hitter with one out in the ninth inning.