The Los Angeles Dodgers are off to their best start since 1999. One of the reasons is a new and improved Chad Billingsley. Another is Juan Rivera, whose bat manager Don Mattingly will be able to enjoy in the middle of his lineup for a full season this time around to complement Andre Ethier and Matt Kemp. Billingsley pitches six sharp innings, Ethier hit an RBI single for his second go-ahead hit in two days and Rivera had a pair of RBI singles among his three hits, leading the Dodgers to a 4-1 victory over the Pittsburgh Pirates on Wednesday night.