The ATP fines committee handed Tiafoe a penalty of $60,000 for aggravated behavior on top of the maximum on-site fine of $60,000 he got for verbal abuse.
The country's 2010 World Cup hero “felt like a tennis player for a moment,” after hitting the professional tennis courts for the first time with Federico Coria.
Sinner will be joined in the last four by Taylor Fritz, who rallied from a set down to defeat Alex de Minaur earlier on Thursday.
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