Mac Williamson hit a go-ahead home run leading off the eighth inning for his first career long ball, Brandon Belt also connected, and the San Francisco Giants beat David Price and the Boston Red Sox 2-1 on Wednesday night to split the quick two-game series. One out later, Javier Lopez relieved to face pinch-hitter David Ortiz, who walked. Belt splashed an 0-1 pitch into McCovey Cove for the 69th by a Giants player and first since Belt did so on Sept. 24, 2014.