Career
Club
Hercegfalvi joined the youth academy of storied Hungarian team Honvéd at the age of 6, and played all the way through their system before making his first team appearance in 1998. He played at Honvéd until 2003, and subsequently enjoyed stints with rivals Videoton Székesfehérvár, Lombard-Pápa TFC, and Czechoslovakian side Slavia Prague, before rejoining Honvéd in 2006. In total, Hercegfalvi spent more than 20 years at Honvéd, and made over 150 appearances for the club
Hercegfalvi joined the Kansas City Wizards on 28 July 2009.
International
Hercegfalvi has also appeared three times for the Hungarian national football team