Washington Nationals' Bryce Harper (34) hits a two-run home run off of New York Mets starting pitcher Zack Wheeler as Travis d'Arnaud catches for the Mets in the second inning of a baseball game at Citi Field on Saturday, Sept. 13, 2014, in New York. (AP Photo/Kathy Kmonicek)
Washington Nationals' Ian Desmond (20) and Bryce Harper share congratulations after the Nationals defeated the Seattle Mariners 8-3 in a baseball game Friday, Aug. 29, 2014, in Seattle. (AP Photo/Elaine Thompson)
Washington Nationals' Adam LaRoche, right, celebrates his two-run home run with Bryce Harper during the ninth inning of a baseball game against the Los Angeles Dodgers on Wednesday, Sept. 3, 2014, in Los Angeles. (AP Photo/Jae C. Hong)
Washington Nationals' Bryce Harper reacts after striking out against the Seattle Mariners in the seventh inning of a baseball game, Sunday, Aug. 31, 2014, in Seattle. (AP Photo/Ted S. Warren)
Washington Nationals’ Bryce Harper celebrates his two-run home run as he approaches first base during the eighth inning of a baseball game against the San Francisco Giants, Sunday, Aug. 24, 2014, in Washington. The Nationals won 14-6. AP Photo/Luis M. Alvarez)
Washington Nationals’ Bryce Harper celebrates his two-run home run as he approaches home plate during the thirteenth inning of a baseball game against the New York Mets, Thursday, Aug. 7, 2014, in Washington. The Nationals won 5-3 in thirteen innings. (AP Photo/Luis M. Alvarez)
Washington Nationals’ Bryce Harper celebrates his two-run home run as he approaches home plate during the thirteenth inning of a baseball game against the New York Mets, Thursday, Aug. 7, 2014, in Washington. The Nationals won 5-3 in thirteen innings. (AP Photo/Luis M. Alvarez)
Washington Nationals' Bryce Harper pumps his fist as he scores the winning run on a single by Anthony Rendon during the ninth inning of a baseball game against the Arizona Diamondbacks on Wednesday, Aug. 20, 2014, in Washington. The Nationals defeated the Diamondbacks 3-2. (AP Photo/Evan Vucci)
Washington Nationals left fielder Bryce Harper (34) steps on the field as he prepares to bat during an interleague baseball game against the Baltimore Orioles at Nationals Park, Monday, July 7, 2014, in Washington. (AP Photo/Alex Brandon)
Washington Nationals manager Matt Williams, left, and left fielder Bryce Harper (34) talk before Harper bats during a baseball game against the Chicago Cubs at Nationals Park, Saturday, July 5, 2014, in Washington. (AP Photo/Alex Brandon)
Washington Nationals left fielder Bryce Harper (34) prepares to bat during a baseball game against the Chicago Cubs at Nationals Park, Friday, July 4, 2014, in Washington. (AP Photo/Alex Brandon)
Washington Nationals' Bryce Harper signs autographs for fans before the start of an exhibition spring training baseball game against the St. Louis Cardinals, Wednesday, March 26, 2014, in Jupiter, Fla. (AP Photo/David Goldman)
Washington Nationals left fielder Bryce Harper (34) waits for a pitch in his first at bat since returning from the disabled list during the second inning of a baseball game against the Colorado Rockies at Nationals Park, on Monday, June 30, 2014, in Washington. Harper is returning to the lineup after missing 59 games with a torn ulnar collateral ligament in his left thumb. At right is Colorado Rockies catcher Wilin Rosario. (AP Photo/ Evan Vucci)
Washington Nationals outfielder Bryce Harper watches batting practice before the start of a baseball game against the Colorado Rockies at Nationals Park, on Monday, June 30, 2014, in Washington. Harper is returning to the lineup after missing 59 games with a torn ulnar collateral ligament in his left thumb. (AP Photo/ Evan Vucci)
Washington Nationals outfielder Bryce Harper warms up during batting practice before the start of a baseball game against the Colorado Rockies at Nationals Park, on Monday, June 30, 2014, in Washington. Harper is returning to the lineup after missing 59 games with a torn ulnar collateral ligament in his left thumb. (AP Photo/ Evan Vucci)