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Keys was once again left exasperated as she made a series of unforced errors, with an overcooked forehand gifting Maria four match points.

But back came the American, who made 12 unforced errors in the opening set, as she upped her level considerably, with a sole break enough to wrap up the decider.

It meant she was unable to stem the flow of mistakes from her racquet, with a huge total of 70 unforced errors illustrating her difficulties.

Gauff had conceded nine double faults across the opening two sets but it was Keys who finished the match with 60 unforced errors off her racquet, compared to Gauff's 41.

Navarro was also hindered by 23 unforced errors compared to just four winners.