Roger Federer says players have to re-examine their playing schedules as they get into their 30s, and avoid playing with injuries.
Both No. 1 Andy Murray and No. 4 Novak Djokovic had injury-affected exits at Wimbledon, having just recently turned 30 themselves. Murray had a hip problem, while Djokovic retired with an elbow injury he says has affected him for a while.
"It's normal," said Federer. "Once you hit 30, you've got to look back and think of how much tennis have I played, how much rest did I give my body over the years. How much training have I done? Did I do enough? Did I overdo it or not enough? It's always calibrating the whole thing."