Two-time 21-year-old grand slam champion Ōsaka Naomi has won her second straight WTA title after a fightback from a set down to beat Australian number one Ashleigh Barty 3-6 6-3 6-2 in the final of the China Open in Beijing on Sunday.

Former world number one and six-time US Open champion Serena Williams will lock horns against Maria Sharapova in the first round of the US Open at Flushing Meadows. Williams, 37, and Sharapova, 32, who have met in the finals of the other three Grand Slam events, have never played each other at the United States Open.