Chicago (18-13) at Los Angeles (20-10)

The Los Angeles Dodgers have the best record in the National League, but the offense has done little to support Jeff Weaver.

The Dodgers, who open a three-game set with the Chicago Cubs, have scored just four runs during Weaver’s current three-game losing streak. They’ll try to deliver a better offensive performance as they look to extend their winning streak to a season-high five games.

Weaver, who will be trying to win for the first time since April 18, allowed two runs and six hits over seven innings of a 2-0 loss to the Florida Marlins on Wednesday.

Los Angeles enters Tuesday’s game after an exciting 9-7 win over Pittsburgh in 14 innings on Sunday. The Dodgers blew a five-run lead in the eighth inning before reserve infielder Olmedo Saenz hit a pinch-hit homer in the 14th.

Saenz, who was 2-for-11 as a pinch-hitter before Sunday, was the only player remaining on the bench. It was his first homer since he hit six for Oakland in 2002.

“He is among a rare breed who can have minimal number of at-bats, yet still walk up there and give you a quality at-bat,” Los Angeles manager Jim Tracy said. “That’s why this man is on the ballclub.”

The Cubs have won three of their past four.

Corey Patterson hit a bases-loaded single in the 13th inning Sunday to lift the Cubs to a 5-4 win over the Colorado Rockies.

“I really wasn’t swinging the bat really well in the previous three at-bats,” Patterson said. “Before I was trying to do too much, thinking too much. So I said, ‘Forget everything and go up there and pick out a good pitch and drive it.”’