2019 US Open: How will Serena Williams handle chair umpire this time?
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VAR to be used at US Open – and could be adopted by Wimbledon
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Croatia's Marija Čičak to become first female to umpire Wimbledon men's singles final | Croatia Week
History-making US Open umpires hope to inspire next generation
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2019 US Open: How will Serena Williams handle chair umpire this time?
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Referee Basic Course - Tennis Wales Coach Development Centre
