Horváth began his career on senior level in 2003 with the team of the PVSK Panthers from Pécs.
He soon became the leading rebounder of the team, and in 2005 moved to the Hungarian league's defending champion, Atomerőmű SE.
There, Horváth won the domestic championship and reached the national cup's final in his first year, and played in the FIBA EuroCup the following season.
[2] Horváth then again became part of the defending domestic champion's roster, in that case Falco KC Szombathely.
He reached the domestic cup's final in 2009, and developed into one of the league's dominating players during his last months, scoring more than 20 points in the first five matches of the season.