John McEnroe is selling at Sotheby’s a rarely seen portrait by Andy Warhol of him with his first wife, actress Tatum O’Neal. Not a lot of people are aware that McEnroe has a serious interest in art and an impressive collection. His first contact with Warhol was at the hip Studio 54 night club in New York, when he went to a charity auction and bid “something like $30,000″ to have their portrait painted by Warhol…read article…