The Giants' game vs the Nationals in Washington D.C. was postponed Friday night due to weather.
Harper struck first base awkwardly while running out a grounder and immediately fell to the ground in pain after appearing to slip on top of the bag.
Harper 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. Saturday's game was delayed three hours with more inclement weather and the rain conditions came into play right away.
Harper is now one of the leaders in the NL MVP race and is hitting.326 with 29 home runs and 87 RBI. He played in 103 of Washington's first 113 games. It was reminiscent of the scene in the same area behind first base on April 29, when Nationals outfielder Adam Eaton sustained a season-ending knee injury, also trying to beat out a groundball.
Despite the loss of Eaton, Washington entered the start of the game with a 14-game lead over the Miami Marlins in the National League East, with Harper back at the forefront of the MVP discussion.