"It's always a challenge for any player in this league when you struggle a little bit," Weiss said. "It starts to maybe get into your head. I think, when in doubt, you let it fly and be aggressive and all those things will come back. Rex will be fine. He's one of the best left-handers in baseball."
Thomas Harding is a reporter for MLB.com. Follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.