Career
De Greef made his Association of Tennis Professionals main draw singles debut at the 2015 Grand Prix Hassan II where he qualified for the main draw and defeated the 8th seed Diego Schwartzman in the first round.
De Greef made his Association of Tennis Professionals main draw singles debut at the 2015 Grand Prix Hassan II where he qualified for the main draw and defeated the 8th seed Diego Schwartzman in the first round.