Career
Kellner reached his highest individual ranking on the Association of Tennis Professionals Tour on 29 August 2011, when he became World Number. 218. He primarily plays on the Futures circuit and the Challenger circuit.
Kellner reached his highest individual ranking on the Association of Tennis Professionals Tour on 29 August 2011, when he became World Number. 218. He primarily plays on the Futures circuit and the Challenger circuit.