Sergei Gennadyievich Demekhine (Russian: Сергей Геннадьевич Демёхин; born 30 March 1984) is a Russian tennis coach and former player. Under his guidance, Vera Zvonareva reached two Grand Slam finals – at the 2010 Wimbledon Championships and the 2010 US Open — and World No. 2 ranking. Demekhine also occasionally used to work as a model for Armani, Rocco Barocco, and Abercrombie & Fitch.