Bryce Harper appeared to injure his left knee when he slipped on a wet first base, a potentially devastating blow to the NL East-leading Washington Nationals.
While running out a ground ball to the right side of the infield in the first inning Saturday night against the San Francisco Giants, Harper avoided contact with first baseman Ryder Jones and his left foot slipped on the base. His leg buckled , he went airborne and fell to the ground as his helmet went flying.
Harper clutched at his left knee after going down and was attended to by trainers. The star outfielder put no weight on his left leg as he was helped off the field by hitting coach Rick Schu and head athletic trainer Paul Lessard.
The game began just after 10 p.m. EST following a three-hour rain delay. It was still raining when Harper's injury happened.
Major League Baseball was in control of weather decisions because it's the Giants' final trip to Washington this season. The series opener Friday was postponed after a lengthy rain delay to be a part of a day-night doubleheader Sunday.
Harper was replaced by Andrew Stevenson, who took over in center field with Brian Goodwin moving to right.
Harper, the 2015 NL MVP, is batting .327 with 29 home runs and 87 RBIs this season. He played in 105 of Washington's 113 games.
Because of a bevy of injuries, the Nationals have used 12 outfielders this season. They have been without Adam Eaton since late April because of a torn ACL in his left knee that ended his season, Jayson Werth since early June because of a bruised left foot and Michael Taylor since July with a right oblique strain.
The Nationals lead the NL East by 14 games despite those injuries and more to starting pitchers Stephen Strasburg and Joe Ross, relievers Shawn Kelley and Koda Glover and shortstop Trea Turner, but a long-term injury to Harper would be far more trouble to Washington's postseason hopes.
Harper is under contract through next season and can be a free agent in the winter of 2018.
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8:15 p.m.: This article has been updated with news of Bryce Harper's leg injury.