Fast, powerful, confident: The next wave of tennis greats are clawing their way up the ranks and looking to take down the sport's dominant top four.
Born: Shreveport, Louisiana
Profile: Harrison's game is in the mold of mentor Andy Roddick – big, explosive serve and muscular groundstrokes. When he was 11, Harrison met his tennis-pro dad in the finals of the Shreveport City Tournament (his father won), and they knew Ryan needed more competition.
Record agains Federer: 0-2. At 18, Harrison came out and double-faulted the first two points, before settling down, breaking Federer, and then losing the set in a tie-break.
Best compliment: From James Blake. "He said, 'You've got a really bright future. Make sure you enjoy the whole thing.'"
Credit: Photograph by Theo Wenner