Naomi Osaka's latest reign as world number one looks to be a short one, with Ashleigh Barty close to dethroning the Japanese.
Nick Kyrgios was fined $113,000 (£93,254) for five separate offences in Cincinnati and Andy Murray says he must change his ways.
Having undergone hip surgery in January, Andy Murray is still on the long road to recovery and will not feature at the US Open.
Naomi Osaka and Ashleigh Barty won through as Madison Keys overcame Simona Halep at the Western & Southern Open.
Novak Djokovic eased into the Western & Southern Open quarter-finals, but Roger Federer crashed out.
After an early singles exit in Cincinnati, Andy Murray accepted a wildcard into the Winston-Salem Open.
Novak Djokovic eased past Pablo Carreno Busta to reach the Western & Southern Open quarter-finals.
Roger Federer's US Open preparations took a hit as the world number three suffered a shock Western & Southern Open defeat to Andrey Rublev.
Nick Kyrgios let his volatile side rise to the fore as he verbally abused an umpire and smashed two rackets, costing him a big ATP fine.
It was a good day for the seeds at the Western & Southern Open as Naomi Osaka, Simona Halep and Ashleigh Barty advanced.