Serena Williams insists it is not an easy life on top of the world despite winning four of the last seven grand slam women's singles titles.
The American cemented her place as the greatest player of her generation with a 13th major title at Wimbledon on Saturday, surpassing Billie Jean King to go sixth outright on the all-time list.
Williams took little more than an hour to see off Vera Zvonareva 6-3 6-2, meaning she retained her All England Club title without having dropped a set.
Challengers to the 28-year-old's dominance appear thin on the ground, with sister Venus seemingly a fading force and former world number one Justine Henin still feeling her way back into the game after a period in retirement.
But Williams believes there is plenty of strength in depth in women's tennis.
She said: "I'm definitely being challenged. These girls are playing so tough. I saw some girls hitting 106mph second serves against me, and I'm thinking, 'Do they normally play like this? Because if so they should be number one'."
