The coach of Australian Open finalist Elena Rybakina has been heavily criticised for his aggressive coaching style from the box on centre court.
Stefano Vukov was shown on the broadcast appearing to berate Rybakina at crucial moments in her semi-final match against Victoria Azarenka on Thursday night.
Coaching is allowed for the first time at the Australian Open this year and some have taken to the new rules with gusto.
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Big serving Rybakina fires into final | 01:12
Rybakina failed to serve out the first set at 5-3 and was down 0-40 at 5-5 when Vukov was shown yelling at the 23-year-old and telling her to think.
Despite the criticism from her box, Rybakina prevailed 7-6 6-3 on Rod Laver Arena to make her second major final.