Yes, we're serious: John McEnroe can pitch as good of a fit on the golf course as he once did on the tennis court. And we have the video proof.
McEnroe was playing golf at the La Romana Country Club at the Casa de Campo resort in the Dominican Republic in advance of an exhibition match against Jim Courier. Apparently, McEnroe disagreed with the read the caddie gave him and tried to make a putt his own way. Once the putt slides by to the right, McEnroe chastises himself by yelling, "I didn't listen!" and then storms off toward the cart...without making the clean-up putt.
We're just going to assume that one's good.