CHICAGO -- The Los Angeles Dodgers finally repaid Clayton Kershaw for a season's worth of picking them up.The Dodgers' ace was far from his sharpest Friday, but the Dodger bats pounded Chicago Cubs pitching, launching four home runs in a 14-5 win at Wrigley Field. In the process, Kershaw (20-3) became the first major-league pitcher to pick up his 20th win.With eight games left, the Dodgers extended their NL West lead to three games pending the result of the San Francisco Giants' game at San Diego later Friday.