Kristof Vliegen (born 22 June 1982) is a Belgian tennis coach and a former professional player.
He is not related to fellow Belgian tennis player Joran Vliegen.
He coached Zizou Bergs until May 2025. He is currently coaching Alex Michelsen since October 2025.
Vliegen turned professional in 2001.
Vliegen was a semifinalist in Chennai in 2006 and in May of the same year, in May of the same year, he reached the final of the ATP tournament in Munich, setting up the first all-Belgian men's singles final against Olivier Rochus. He was also the 30th seed at the 2006 Wimbledon Championships, where he reached the 2nd round before losing to Nicolas Mahut in straight sets.
In Doha, the first tournament of the year he defeated Spaniard ÃÂscar Hernández with 6âÂÂ1, 6âÂÂ7 and 6âÂÂ7. In the next round he faced German Philipp Kohlschreiber. He was defeated in three sets 4âÂÂ6, 7âÂÂ6 and 6âÂÂ4. At the Australian open he met Italian Simone Bolelli but lost in three long sets 6âÂÂ7, 5âÂÂ7 and 6âÂÂ7. One week later he started in the SA Tennis Open as the seventh seed. In the first round he won in two straight sets of unranked Ross Hutchins. In the next round he defeated Czech Jan Mináà Â. In the quarterfinals he lost to world number 6 Jo-Wilfried Tsonga in straight sets 4âÂÂ6 and 1âÂÂ6. At the Open 13 in Marseille he faced Czech Jan Hernych in the first round but lost in three sets: 6âÂÂ3, 3âÂÂ6 and 6âÂÂ4.