Muguruza new No 1, Stephens returns to top 20
Garbine Muguruza officially became world number one for the first time, as Sloane Stephens soared back into the top 20 after her surprise US Open triumph. Wimbledon champion Muguruza takes over from Karolina Pliskova at the top of the rankings. Stephens, who was ranked 957th six weeks ago after a long injury absence, jumps 66 places to world number 17 after winning 15 of her last 17 matches, including the 6-3, 6-0 thrashing of fellow American Madison Keys in Saturday's US Open final. Seven-time major champion Venus Williams, 37, has returned to the top five for the first time since January 2011, while her sister Serena, who gave birth to her first child during the US Open, drops out of the top 20 for the first time in six years.