NEW YORK (Reuters) - Barbora Krejcikova survived a Garbine Muguruza fight back and late injury issue to claim a 6-3 7-6(4) win and move into the quarter-finals of the U.S. Open on Sunday, while her Spanish opponent's run at Flushing Meadows ended at a familiar roadblock.

Playing in the U.S. Open main draw for the first time after failing to qualify on five occasions, Czech Krejcikova has suddenly found form on the New York hardcourts, at times looking as comfortable as she did earlier this year on clay winning the French Open.