Eight-time Grand Slam champion Andre Agassi has admitted that tennis players are fitter now than in his days as a professional.
The 42-year-old, whose game was based on wearing opponents down, believes that the intensity of matches in the modern era has died somewhat, but says that he is taken aback by the physical capabilities of players nowadays.
"I marvel at [their endurance], first of all," Agassi told Australianopen.com. "When I played, my whole game was based on playing with that sense of urgency and to force guys to be ballistic out there, to treat a marathon like a sprint.
"I had more or less four hours in me before I knew I was running on borrowed time physically. That's four hours of me running other people, you know.
"So to watch them do it, they're more calculated now, they play slower, so six hours is not the same six hours that I played. But they're also much better athletes."
Agassi won four Australian Open titles and will award the trophy to the winner following Sunday morning's final.
