All Tennis Players How Many Grand Slams Has Brian Teacher Won? Brian David Teacher (born December 23, 1954) is a former American professional male tennis player.Brian Teacher has won 1 Grand Slam. Facebook Twitter Email How Many Grand Slams Has Coco Gauff Won? How Many Grand Slams Has Marketa Vondrousova Won? How Many Grand Slams Has Aryna Sabalenka Won?