(Sports Network) - A battle of division leaders will resume tonight at Arizona's Chase Field, where the Diamondbacks and Chicago Cubs continue a three-game series.

The Diamondbacks won for the second time in three games by posting a 2-0 victory over the Cubs in the opener of this set behind the left arm of starting pitcher Randy Johnson. Johnson allowed just two hits over seven shutout innings while striking out four and walking one to move to 13-0 lifetime against the Cubs.

Chad Qualls worked out of trouble in the ninth to pick up his second save of the season.

Alex Romero hit a solo home run and Stephen Drew added an RBI triple for Arizona, which has only three wins in its last seven contests and remains tied with the Los Angeles Dodgers atop the National League West standings.

Arizona will rest its hopes on starter Yusmeiro Petit Tuesday evening, and he is 0-1 with a 3.06 ERA in nine games (1 start) this season. Petit is taking the place of Micah Owings in the rotation. Owings pitched an inning of relief on Monday.

Petit last pitched on Friday versus the Dodgers in an 8-7 loss, recording a no-decision after allowing a solo home run in three innings of work. The right-hander is 1-0 with a 3.27 ERA in three career games, two of which have been starts, against the Cubs.

Chicago is currently two games ahead of both St. Louis and Milwaukee in the NL Central, but has lost four of its last five games to lose ground in the division standings. In Monday's loss to the D'Backs, Reed Johnson and Jim Edmonds had the only two hits for the Cubs.

The setback ruined an excellent performance from newcomer Rich Harden, who hurled seven innings of one-run, one-hit ball while striking out 10 batters despite absorbing the loss. Bob Howry allowed a run in relief.

Taking the hill for the Cubs tonight will be Jason Marquis, who is winless over his past three trips to the hill (0-2). Marquis did not factor in the outcome of a 3-1 win over San Francisco in July 11 his last time out, although he allowed just three hits over seven shutout frames.

Marquis, who is 6-5 with a 4.44 ERA in 17 starts in 2008, owns a 2-4 record in nine career appearances (8 starts) versus Arizona.

Chicago swept a three-game set against Arizona at Wrigley Field in May to avenge the Diamondbacks' disposing of the Cubs in last October's National League Division Series, in which Arizona took all three matchups.

The D'Backs won two of three from Chicago at Chase Field last year.