Nationals infielder Mark DeRosa, already on the disabled list with a strained left oblique muscle, reportedly tweaked the injury when he high-fived the 19-year-old phenom after he stole home against the Phillies Sunday.
"I don't know if that set back the rehab or not," Nationals manager Davey Johnson told The Washington Post. "But I said, 'Why didn't you use your [right] hand?' He said it was spur of the moment."
DeRosa was not alone in expressing enthusiasm after Harper stole home. The Nationals dugout was already fired up after Phillies ace Cole Hamels intentionally plunked the rookie outfielder in what he later referred to as a "welcome to the big leagues" moment.