MLB: Chicago Cubs 4, Arizona 1

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CHICAGO, July 14 (UPI) -- Ryan Dempster tossed six shutout innings Saturday and the Chicago Cubs handled the Arizona Diamondbacks 4-1.

Dempster (5-3) lowered his major league baseball-best ERA to 1.86 with the six scoreless frames, during which he scattered four hits, issued three walks and struck out five.

The Chicago right-hander, who is the subject of trade rumors, stretched his scoreless streak to 33 innings in winning his fifth straight start.

Shawn Camp hurled a scoreless eighth inning and Carlos Marmol picked up his ninth save for the Cubs, who clinched their three-game series at Wrigley Field.

Starlin Castro, Darwin Barney and Luis Valbuena supplied RBI in the victory.

Joe Saunders (4-6) absorbed the loss for Arizona, allowing four runs (three earned) on eight hits over six frames.

Chris Young socked a solo homer for the Diamondbacks.