Clayton Kershaw became the Los Angeles Dodgers' first 20-game winner in 21 years, beating San Francisco 2-1 on Tuesday night and pushing the Giants closer to elimination from the NL West race. Kershaw (20-5) allowed six hits and one run in 7 1-3 innings, walked two and struck out six to go 5-0 against the Giants this season -- the first Dodgers pitcher to do so since Vic Lombardi in 1946.