NEW YORK — There was nothing mysterious about Michael Pineda's performance. Masahiro Tanaka's dominant outing was pretty straightforward, too.
A day that began with snow in the outfield ended with a double whitewashing.
Pineda followed an overpowering start by Tanaka with one of his own, pitching six four-hit innings as the Yankees beat the Cubs 2-0 on a bitterly cold Wednesday night to complete their first doubleheader shutout sweep since 1987.
"It just goes to show you how well our pitchers threw," New York manager Joe Girardi said. "When you shut out a team for 18 innings you're doing things right."
Tanaka struck out 10 and allowed just two bunt hits over eight innings in a 3-0 win in the opener. Carlos Beltran homered for a third straight game, off former Ray Jason Hammel in the first inning of Chicago's first regular-season game at the current Yankee Stadium.
Brett Gardner and Scott Sizemore had RBI singles off Travis Wood in the nightcap, helping the Yankees win for the fifth time in six games.
Pineda was pitching for the first time since he was spotted with brown goo on his right hand during Thursday's 4-1 win against the Red Sox, touching off a debate about pitchers' use of sticky substances to get better grips in cool weather. It was colder Wednesday, with temperatures in the low 40s and a frigid wind, but Pineda's hand was clean throughout.
"I didn't do nothing," Pineda said when asked if he used something to improve his grip. "I was focusing on throwing the ball good."