LOS ANGELES -- The Los Angeles Dodgers would love to go into this weekend's pivotal series in San Francisco with a four-game lead so that even a sweep wouldn't prove disastrous. It doesn't look as if that's going to happen.The Dodgers played more shoddy defense and got another bad start from Roberto Hernandez to lose 6-3 to the San Diego Padres on Tuesday night. Meanwhile, the Giants soundly defeated the last-place Arizona Diamondbacks, 5-1, to trim the Dodgers' NL West lead to 2 1/2 games.