Novak Djokovic only member of Big Three at US Open.
There will be no Madrid Open this year.
"It is a good one to get through," says Andy Murray.
Kyle Edmund makes short work of Jan Choinski.
The WTA Tour resumes on Monday in Sicily.
Nick Kyrgios says decision "hurts me at my core".
Andy Murray happy with display.
Unnamed player has withdrawn from WTA Tour event.
The pair clashed earlier in the week.
Murray would have no sympathy for rule breakers.