Popp's career highlights are making the quarterfinals of Wimbledon (by far his most successful tournament) in 2000 (defeating Gustavo Kuerten and Michael Chang en route), and in 2003 (defeating Jiří Novák).
Popp's career highlights involve achieving significant results at Wimbledon (his most successful tournament), such as reaching the quarterfinals in 2000 by defeating Gustavo Kuerten and Michael Chang, and again in 2003 against Jiří Novák.