Born on Feb 14, 1988, in Moscow, Russia, this 20-year-old Russian tennis player is a cousin of retired famous tennis pro Anna Kournikova. Korolev started to play tennis at the age of four with the help of his father, a former hockey player who is also his coach. Currently the second youngest player in the top 100, he never played in the junior circuit although he competed in his first game at the age of ten with the help of a sponsor and picked up his first ATP points at the age of fifteen during the German Challengers. He turned pro in 2005 and currently appears on the ATP tour.
Korolev reached the quarterfinals in the Medibank International in 2007. In the same year he also made it to his first career ATP semifinal. A year later, in 2008, the Russian player reached the quarterfinals in Sydney, which he unfortunately lost to Fabrice Santoro. Undeterred, he then went on to win his next matches against Marcel Granollers at the Australian Open and Sergio Roitman during the first round of The Tennis Channel Open, a win which he followed up with another over Chilean player Fernando Gonzales in the second round. Korolev’s next victory was against Igor Andreev at the Open de Tenis Comunidad in Valenciana on April 2008. He got to the second round and defeated Robin Haase in the quarterfinals before losing to Nicolas Almagro in the semifinals. He also reached the quarterfinals of the Orange Pokrom Open before bowing to Russian no. 1 Nikolay Davydenko.
Korolev currently has no career titles. His highest ranking in singles was at no. 63 as of April 16, 2007.