"Why not?!" Rafa says.
Of course, 33-year-old Nadal is one of the best men's tennis players ever ... and 21-year-old Naomi is currently the women's No. 1 ranked player -- so when we got Nadal leaving Milos in NYC on Thursday, we had to ask if they'd ever battle on the court.
Ya gotta see Nadal's answer ... the guy seems all kinds of down for it!!!
As for why Nadal thinks he, Roger and Novak Djokovic have been dominating the sport for so long, he tells us, "We love what we do, my friend!"