Article Photos: Arrieta shines, but Cubs lose 2-1 to Nationals 1/3

Washington Nationals first baseman Adam LaRoche, left, tags Chicago Cubs' Ryan Sweeney, right, out at first base during the third inning of a baseball game at Nationals Park, Sunday, July 6, 2014, in Washington. Sweeny was called safe, but the play was overturned and he ruled out. (AP Photo/Alex Brandon)