ATP

Murray did not have it all his own way against Istomin but progressed after a 6-3, 7-5 win, saving four out of five break points in the process.

Djokovic eased past Kyle Edmund in 80 minutes. Berdych progressed without taking to the court, while Marin Cilic, Richard Gasquet and David Ferrer als

Tournament organisers announced the Swiss had been pulled ahead of Friday's second-round meeting with Juan Martin del Potro.

Fernando Verdasco was also among the winners in Florida, with no seeds in action at the ATP 1000 event.