If you were to remove the lungs from an average human and spread them completely out, they’d have the surface area of a tennis court.
It would also get you disqualified from your match. It’s considered bad form to rip out your opponent’s lungs and spread them across the court. Although Andre Agassi coked up enough to do it, some say. And John McEnroe made people think he’d do that to a referee or two.
Then again, seeing how fierce Wimbledon is about playing on grass, I’m sure they’d change to lung-surfaced courts before they’d ever consider clay or concrete.