Dani Vallverdu on what he's learnt coaching the world's best players

The current coach of Stan Wawrinka and Karolina Pliskova talks about a number of subjects, including working with his current charges, coaching the likes of Andy Murray and Grigor Dimitrov and what's he's learnt from fellow coaches Magnus Norman and Ivan Lendl. He also talks about the best and worst advice he's ever given a player, growing up with Andy Murray at the Sanchez-Casal Academy, life away from tennis and his hopes for the future of the game.