Serena Williams gets coaching violation from umpire Carlos Ramos

The 36-year-old, who was targeting a record-equalling 24th Grand Slam singles title at Flushing Meadows, angrily confronted umpire Carlos Ramos after being told off for what he deemed a coaching intervention.

Serena stormed up to his chair and informed him that she would never deliberately receive guidance from her coach, Patrick Mouratoglou, who was sat in the players' box.

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She informed Ramos in strong terms:

Williams was clearly still fuming as she sat at the changeover at 2-1 up in the second set, before getting a point docked for hurling her racket to the ground, and then launching a series of tirades at the umpire, who sent her further into a rage when he handed her a game penalty for verbal abuse.

She followed that up by calling him a "thief" for taking a game away from her.

In a further exchange, Williams again informed umpire Ramos that she is not a cheat and did not receive coaching from Mouratoglou, even adding that she had a daughter so would not do that.

The confrontation came at a time when Williams perhaps needed a spark after she lost the opening set 6-2 to the dominant Japanese starlet.

The 20-year-old Osaka displayed an array of stunning groundstrokes in storming to a famous victory - Japan's first Grand Slam.