The Colorado Rockies and Los Angeles Dodgers begin a pivotal three-game series Friday with the Rockies looking to widen their lead in the National League West. The Rockies began their current 10-game homestand with a series sweep against the San Francisco Giants and have won five straight games. The Rockies (77-62), who are in their 26th season, have never won the division and are assured of leading the NL West Friday after playing their 140th game, which is the latest in franchise history that they have been in first place.