Dave Winfield drove in four runs, including two with his first home run of the year, and left-hander John Curtis pitched a five-hitter through eight innings tonight to lead the San Diego Padres to a 4-2 victory over the San Francisco Giants.

Winfield, who had driven in seven runs in the first three games, got the Padres off to a 2-0 start with a two-run single in the third. The hit off loser John Montegusco drove in Ozzie Smith, who had walked, and Gene Richards, who reached on a fielder's choice.

In the fifth, Winfield connected for his homer following a single by Richards.

The 32-year-old Curtis, who pitched for the Giants last seasons and then played out his option and signed with the Padres as a free agent, blanked the Giants for seven innings before giving up a pair of runs in the eighth. Bob Shirley pitched the ninth for the Padres.

Giant third baseman Darrell Evans, who set a modern National League record by committing three errors in the seventh inning of Friday night's game, also booted the first two balls hit to him tonight. In the two games he was charged with five errors on four ground balls.