Travis Wood and three other relievers combined for seven perfect innings after starter Jason Hammel left with cramps, and the Chicago Cubs held the Los Angeles Dodgers to one hit in a 2-0 victory Monday. Wood (3-0) pitched four perfect innings in his longest stint of the season. Justin Grimm, Pedro Strop and Hector Rondon pitched one inning each for the Cubs, with Rondon getting his ninth save.