By his own definition, Nick Kyrgios should be suspended until 2025 for an incident where he hit a spectator in the head with a deliberate skyward bomb.

The 21-year-old was practising on a crowded Court 11 at Melbourne Park ahead of his first-round match at Hisense Arena against Gastao Elias last night, when his lighthearted training session had a brief, scary moment for one fan.

In the middle of some lighthearted games with his hitting partner and conditioning coach, Kyrgios picked up a ball after some loose warm-up shots and bashed a swooping forehand as high as he could into the air.

Watched by a huge crowd jammed along the fence of his outside court, the ball came down and hit a young Melbourne girl in the head.

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The crowd issued a collective grimace and "ooh" in feeling the young fan's pain. She told news.com.au she was not hurt by the ball hitting her on the top of her head, but was left surprised and embarrassed, after becoming the focal point for the large crowd.

Kyrgios was criticised by some spectators around the court for failing to check if the young girl was harmed by the head shot. He was in the middle of his practice session.

It comes after Kyrgios took a shot at the ATP Tour and world No. 2 Novak Djokovic earlier this month over a code of conduct warning issued to the Serbian. Kyrgios hinted double standards were at play on the ATP Tour, when Djokovic threw his racquet in anger, hit a spectator at the Qatar event and escaped with a warning.

Kyrgios earlier wowed the crowd gathered at Court 11 with his lighthearted antics and games.

The crowd gathered at the practice court was so large ahead of Kyrgios' 3.30pm booked training appearance, security guards initially advised security staff they would not be able to move the world No. 13 through the mob to reach the court entrance.