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Australian Open 2019: Deciding-set super tiebreak marks four rules for as many Slams as tennis gears up for innovation - Sports News , Firstpost
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Australian Open 2019: heat and tie-break rule changes – explained | Australian Open 2019 | The Guardian
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Katie Boulter reaches second round of Australian Open - despite being unaware of tie-break rule change
Australian Open 2019, tie-break rules, super tie-break at 6-6, big change to final sets, longest Australian Open match ever | Fox Sports
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