Players concerned with extreme heat at Aussie Open, but what's the solution?

MELBOURNE, Australia -- Gael Monfils is one of the most athletic and fit players in men's tennis, but in the closing moments of his second-round match against Novak Djokovic, the Frenchman was staggering around between points at Rod Laver Arena like a punch-drunk boxer. Juan Martin del Potro has been bravely recovering from a wrist injury that has led to multiple surgeries the past two years, but that had nothing to do with the No. 12 seed getting treatment from a trainer while stretched out on the court during his final few games against Karen Khachanov. ...