Hall of Fame
If you're talking about Hingis and Kournikova, Hingis didn't overpractice. But she hit for more than 4 hours. 4 hours isn't a complete practice to players of her caliber unless they're already in their zone. After her '97 rise, she tailored her practices down that way. That was a bad move, and she was back to 6 hours minimum by late-'98. Kournikova never tailored her practices down if her body could handle it, and she practically lived on the court. People have the opposite perception because they used to read the tabloids: reporters and paparazzi harped on each and every little thing she did whenever she was off the court. Nowadays, the forum posters from back then spread rumors from those tabloids, and the newer generations of internet-goers regurgitate what the older forum posters said without bothering to use their heads. You don't tear your feet to shreds by taking photos with your boyfriend all day. In fact, her boyfriends were also some of her hitting partners.The announcers are always talking about how hard they work. Do they work harder than a suburban high school varsity soccer player (male or female)? I'm serious. You can't be on the court more than 4 hours. Do some running and a lot can be accomplished in the gym in 30 minutes. Shut up about cross training. It's called playing another recreational sport. John Updike sat at his desk three hours a day and produced a novel a year. Writer Martin Amis said being an artist is a part time job. Maybe the woman overpractice trying to establish "timing" rather than modifying technique to withstand inevitable slumps. That is what makes matches less stressful.
If you're talking the newer players, most of them don't follow the disciplined regiments (not "regimen" for a reason) players like Hingis did. I wouldn't call Kournikova disciplined because she didn't know when to quit, but she definitely turned everything into a regiment. Today's players follow light regimens that consist of mostly cardio with some hitting sprinkled in here and there, and posters here'll tell you there isn't much to change at the pro level compared to the junior level- until the pros start underperforming because they can't raise their games to levels high enough to make their slumps game-winning. Hingis in '98 was still at the top because she'd learned so much in the past two years that her slumping couldn't knock her off.