His worst moment of the season, however, came on a day he didn't pitch.Two days after he was arrested on a drunken-driving charge with a blood-alcohol content nearly three times the legal limit, Gallardo is scheduled to take the ball as the Brewers try to sweep the visiting San Francisco Giants in Thursday's finale.A motorist reported seeing a driver repeatedly swerving between lanes about 2 a.m. on Tuesday morning, and deputies spotted Gallardo driving alone at 40 mph in a 55-mph zone. Authorities say a breath test revealed a blood-alcohol level of 0.22, nearly three times the legal limit of 0.08, and the reading was matched by a second breath test following his arrest.In Wisconsin, first-offense drunken driving is a citation, not a misdemeanor or felony charge. Milwaukee County sheriff's spokeswoman Fran McLaughlin said Gallardo faces nearly $800 in fines for drunken driving and for unsafe driving.Prior to Tuesday's opener, Gallardo apologized for his actions."I made a bad decision," he said. "I made a mistake and I'm sure I lost a lot of respect from the fans and I just want to apologize to the fans, my teammates, my family."Like I said, it's just a bad call. Something I shouldn't have done. I regret it. ... It's just ... it's not very easy. It's one of those things ... I truly am sorry."On the mound, Gallardo (0-1, 6.61 ERA) hasn't much resembled the pitcher that won 16 games last season. He gave up six runs over 5 1/3 innings in Saturday's 8-0 loss to St. Louis, and opponents are batting .371 off him.He's also not fooling many batters, striking out three in each of his three starts -- an average of 5.0 per nine innings. From 2009-12, Gallardo recorded four straight 200-strikeout seasons and ranked fourth in the majors with an average of 9.4 per nine innings.A matchup with the Giants might be what Gallardo needs to get things turned around.In six starts against San Francisco since 2009, the right-hander is 4-2 with a 1.91 ERA -- tied for his lowest ERA against any team.The Giants (9-6) arrived in Milwaukee winners of six of seven but have dropped the first two with the Brewers (5-8), who had just two victories in their previous 10 games.Milwaukee won 4-3 Wednesday on Blake Lalli's pinch-hit single with one out in the ninth, scoring Josh Prince from third. Prince got to third on an ill-advised, off-balance throw by shortstop Brandon Crawford in an attempt to get Carlos Gomez out at first two batters earlier."He didn't have a shot there," manager Bruce Bochy said of Crawford's decision.Seeking their first home sweep over the Giants since 2008, the Brewers go up against Matt Cain (0-1, 5.94), whose 5.56 ERA in five starts at Miller Park is his second-worst at any NL ballpark.Cain, who had the majors' third-best home ERA last year at 2.03, has been solid in his two road starts this season, posting a 1.38 ERA while striking out 14 in 13 innings. At Wrigley Field on Friday, the righty gave up two runs on a pair of homers over seven innings in a game the Cubs rallied to win 4-3.Ryan Braun is batting .364 with a double and triple in 22 at-bats versus Cain, but the Milwaukee slugger is 1 for 18 with 11 strikeouts in his last five games.San Francisco's Pablo Sandoval, who is batting .350 with 12 RBIs during a 10-game hitting streak, is 2 for 15 lifetime against Gallardo.