SAN DIEGO (AP) - Kevin Kouzmanoff's homer was one of just four hits for the San Diego Padres, who still managed to beat the San Francisco Giants 2-1 on Wednesday night in a matchup of the two lowest-scoring teams in the NL.

The Padres won their fifth straight game, matching their season high. Even so, they are four games under .500. San Francisco lost for the sixth time in seven games to drop one game under .500. The Padres also beat the Giants 2-1 on Tuesday night, spoiling Barry Zito's complete game.

Right-hander Chad Gaudin (1-3) won for the first time in five starts for San Diego. He was signed to a minor league contract on April 12 after being released by the Chicago Cubs. After two starts for Triple-A Portland, he had a no-decision in his Padres debut, then lost three straight starts.

Gaudin allowed one run and five hits in six innings, walked four and struck out three.

Heath Bell pitched a perfect ninth for his 11th save in as many chances. He has thrown 17 scoreless innings to start the season, making him one of two qualifying relievers posting a 0.00 ERA. Texas' Frank Francisco is the other.

Giants manager Bruce Bochy was ejected by first base umpire Gary Cederstrom after arguing a call in the bottom of the eighth. Third baseman Pablo Sandoval fielded David Eckstein's grounder and his throw pulled first baseman Travis Ishikawa off the bag, but TV replays showed he got his foot back on the base just before Eckstein arrived.

Left-hander Jonathan Sanchez (1-4) took the loss despite allowing two runs and two hits in six innings. He struck out five and walked three.

Bochy moved Aaron Rowand into the leadoff spot in an attempt to shake up the slumping Giants. Rowand had three of San Francisco's six hits but was stranded each time.

This was the first time in 16 games the Giants lost after scoring the first run.

San Francisco gave Sanchez a 1-0 lead when Emmanuel Burriss singled in Randy Winn with two outs in the second. Winn had two hits to improve to 17 for 40 (.425) in his last 10 games, with 11 runs and eight RBIs.

Sanchez walked Nick Hundley with two outs in the bottom of the inning, and he came around to score on Chris Burke's double into the left-field corner.

Kouzmanoff homered into the seats in left on the first pitch of the fourth, his third.

Notes:@ Padres ace Jake Peavy will start Friday night against the Cubs on his normal four days' rest. He had been given the option of getting an additional day of rest and starting Saturday night. Josh Geer will start Saturday. ... Green Bay Packers QB Aaron Rodgers, who lives in Del Mar during the offseason, was at the game with some friends and got to hang out in the Giants' dugout during batting practice. The Chico native said he pitched his senior year of high school before playing football at Cal. ... Zito had gone 185 straight starts without recording a complete game, which, according to the Elias Sports Bureau, was the second-longest streak in major league history. Zito's complete game Tuesday night was his first since Aug. 7, 2003, while with Oakland. Former Giants pitcher Kirk Rueter owns the longest streak of 193 starts without a complete game from 1999 to the end of his career in 2005.

Copyright 2009 The Associated Press.