Shot clocks will be used in all ATP Tour tournaments out of 2020.

The clock – which counts down the 25 seconds allowed between points – had been trialled at the nextgen ATP Finals in 2017 and was first used at a Grand Slam at the 2018 .

World number two previously criticised the device and said it could “ruin the entertainment variable” at .

The WTA may also use shot clocks in Premier-level tournaments in 20-19.