Just as they're getting ready to welcome back Madison Bumgarner, the San Francisco Giants could be losing Johnny Cueto for at least one start. Cueto lasted only four innings before being forced out by blisters on his thumb and two fingers on his right hand Friday night, when the Giants got some late runs and a high-wire act from Sam Dyson in the ninth inning to beat the San Diego Padres 5-4. Denard Span singled home the go-ahead run in the sixth and Buster Posey homered an inning later.