First pitch in Washington was delayed three hours Saturday night and there was still a steady drizzle when the game got underway. While attempting to run out a ground ball in the first inning, Bryce Harper hit first base awkwardly and slipped on the slick surface. He immediately fell to the ground clutching his knee and had to be helped off the field.

Harper entered Saturday’s game with a .327 average and 29 home runs for the NL East-leading Nationals. His 5.0 WAR is fifth in all of baseball.