The former head of WADA was on BBC breakfast this morning .
He said ( not quoting him word for word ) that before the Wimbledon centre court had a roof - when it rained ,they used to put on screen past matches of the likes of Connors and others , who use to trundle ( trundle was not the word he used , i can't remember the exact word ) - whereas now you have players sprinting across court for 3 , 4 hours .
The inference he was making i beleive , is that these players nowadays must be on something to maintain that level of stamina