Mired in a season-high four-game losing streak and having been swept by the crosstown rival White Sox over the weekend, Chicago (50-33) broke out with a 9-2 rout of San Francisco on Monday night.

"It was fun to watch," said Monday's winning pitcher Ted Lilly. "After what happened against the White Sox, it's nice for us to get this one going."

The win snapped the Cubs' six-game road losing steak while dropping the Giants' major-league worst home mark to 14-25. Though Chicago is 17-23 away from Wrigley Field, it still owns the best record in the NL and a 2 1/2-game lead over St. Louis in the Central Division.

The Cubs are 2-5 since sweeping the White Sox at home from June 20-22.

With outfielders Alfonso Soriano (finger) and Reed Johnson (back spasms) still on the disabled list, Chicago also managed to get by Monday without RBI leader Aramis Ramirez, who will miss the first three games of the set to be with his pregnant wife in the Dominican Republic.

Starting in the third baseman's place, Mark DeRosa went 3-for-4 with two homers - including a grand slam - for a career-high six RBIs as the Cubs' offense came alive after scoring 13 total runs during their losing streak.

The versatile DeRosa has hit safely in six straight games, batting .409 (9-for-22) with two homers during that span.

"It felt good to contribute," said DeRosa, who had five RBIs over his previous 17 contests. "We needed this win, no doubt. We've had our share of adversity."

The Cubs hope Jason Marquis (6-4, 4.96 ERA) can bounce back from his shortest outing of the season when he takes the ball Tuesday.

Trying for a sixth straight winning decision, Marquis allowed seven runs and seven hits in four innings of an 11-4 loss to Baltimore on Thursday.

"I just wasn't very good," said Marquis, who is 3-0 with a 2.12 ERA in four starts against the Giants - all of which have come in San Francisco.

The Giants counter with Matt Cain (4-6, 4.44), who is 0-2 with a 5.88 ERA in his last four starts at home. In his most recent outing, Cain allowed four runs and eight hits in five innings of a 4-1 loss at Cleveland on Thursday.

The right-hander is 3-2 with a 4.09 ERA in five career starts against Chicago, and despite his recent struggles at home, is 2-1 versus the Cubs at AT&T Park.

Rich Aurilia had two hits and drove in a pair of runs in the ninth inning Monday for San Francisco, which came off a 5-4 road trip but lost for the eighth time in nine home contests. The Giants have scored two runs or fewer in five of their last seven games at AT&T Park.

"I think we've talked about it too much," manager Bruce Bochy told the Giants' official Web site of their home struggles. "That's sort of compounding our problems."

Aurilia is 5-for-9 with seven RBIs in his last two games.