Juniors Harper-Griffith was a
boys' singles quarter-finalist at the
1999 Australian Open and a boys' doubles semi-finalist (with
Andy Roddick) at the
1999 US Open.
Pro tour On top of their semifinal run in the juniors, Harper-Griffith also competed with Roddick in the men's doubles draw at the 1999 US Open, making the second round. At the
2001 US Open, Harper-Griffith lost to Spaniard
Albert Costa in the opening round of the men's singles. It would be his only appearance in the men's singles draw of a Grand Slam but he did make another US Open doubles appearance, in 2002, with
Eric Taino. The pair defeated
Dominik Hrbatý and
André Sá in the first round, before being eliminated in the second round by
Jiří Novák and
Radek Štěpánek. ==Challenger titles==