Harper led the Majors with 13 home runs, an .884 slugging percentage and tied two others -- Braun and Texas' Prince Fielder -- for the most RBIs, with 28. The 22-year-old also led the NL in on-base percentage (.495) and runs (24) while ranking among the league leaders in batting average (.360, third) and total bases (76, second).
Harper's 13 homers set a Nats team record for most home runs in a month, eclipsing the 12 Alfonso Soriano launched in May 2006.
Harper's hot streak coincided with the Nationals going 18-8 in May; he drove in six game-winning runs and six of the go-ahead variety.