In 2000, Kramnik defeated Garry Kasparov and became the Classical World Chess Champion. He defended his title in 2004 against Péter Lékó, and defeated the reigning FIDE World Champion Veselin Topalov in a unification match in 2006. As a result, Kramnik became the first undisputed World Champion, holding both the FIDE and Classical titles, since Kasparov split from FIDE in 1993.