According to the sports merchandise company Fanatics, Harper broke the all-time record for the best 24 hours of sales for a jersey launch for any player in any sport.
Fanatics says sales of Phillies merchandise was up more than 5,000 percent vs. the same day last year.
The Phillies gave Harper a 13-year contract, the largest deal in baseball history at $330 million.
"I want to be on Broad Street on a frickin' boat or bus or whatever it is and hold a (World Series) trophy over my head," the six-time All-Star said Saturday after putting on his new No. 3 jersey.