SAN FRANCISCO (AP) — Madison Bumgarner was so enthused by seeing Buster Posey hit a grand slam, he did the same thing the next inning.Bumgarner became the first pitcher in 48 years to hit two grand slams in a season, and Posey also hit a slam Sunday that boosted the San Francisco Giants over the Arizona Diamondbacks 8-4.“Everybody was excited to get a big hit like that,” Bumgarner said of Posey. “That put us back in the lead. That’s what big-time players do and he’s a good one already.”Posey and Bumgarner became the first batterymates in major league history to hit grand slams in the same game.“That’s pretty cool,” Bumgarner said.