PITTSBURGH (KDKA/AP) — The Pirates were looking to finish off a three-game sweep in Chicago Sunday afternoon, but two errors by shortstop Ronny Cedeno helped to dash those hopes as the Cubs pulled off a 6-3 win.

Neil Walker hit a two-run shot in the eighth and Derrek Lee had three hits for the Pirates, who have now lost six of eight.

Bucs starter Charlie Morton (9-9) allowed four runs, three earned on seven hits. He struck out two and walked five.

For the Cubs, Randy Wells (7-4) allowed one run while scattering seven hits. He struck out two and walked two. He is 6-1 over his last eight outings after going 0-3 with a 7.38 ERA in his first nine starts once returning from the disabled list.

Chicago had runners on first and second with no outs in the first three innings, but failed to score until the third.

Trailing 1-0, Carlos Pena hit a sharp grounder to Walker at second base. Walker made a low throw to Cedeno, who was covering second to get one out, but Cedeno’s throw to Lee at first was wide, allowing Tony Campana to score from second on the overthrow.

With two outs in the fourth inning and Koyie Hill on second, Starlin Castro hit a grounder to third baseman Josh Harrison. Harrison fielded the grounder, but his throw to first took Lee off the base so Lee attempted to tag Castro.

First baseman umpire Jim Wolf ruled Lee’s tag did not make contact with Castro. Hill, who never stopped on the base paths ended up scoring from second on the play. Lee argued with Wolf and Pirates manager Clint Hurdle came out of the dugout to also have an animated discussion with Wolf to no avail.

The Cubs added to its lead in the fifth. With runners on first and second and no outs, Bryan LaHair hit a ball that brushed Morton’s jersey. Cedeno fielded the grounder but the ball rolled out of his mitt, allowing LaHair to reach safely on the error.

With the bases loaded, Byrd hit a sacrifice fly.

Hurdle pulled Morton after he hit Darwin Barney with a pitch to load the bases again. Pirates reliever Tony Watson got Hill to hit a bouncer back to him, but the ball pulled him off the mound forcing him to go to first to get the out, which allowed Pena to score and make it 4-1.

LaHair hit a two-out, RBI bloop single off Watson in the sixth inning to make it 5-1. LaHair finished with two hits in his season debut.

After hitting a go-ahead grand slam in the ninth during Saturday’s win, Lee hit an opposite field RBI single in the first inning to give the Pirates a 1-0 lead.

Walker hit his two-run homer off Cubs reliever Jeff Samardzija in the eighth inning. It was Walker’s 12 of the season.

But Byrd added an insurance run for the Cubs in the eighth with an RBI single off Pirates reliever Jose Veras.

Cubs reliever Sean Marshall pitched a scoreless ninth for his fourth save in eight chances.

Up next, the Pirates return to Pittsburgh for a three-game series against the Houston Astros starting Monday at 1:35 p.m.

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