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Roger Federer survives massive scare at Australian Open to win final set tie -break from 8-4 down - Independent.ie
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Australian Open 2019: heat and tie-break rule changes – explained | Australian Open 2019 | The Guardian
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Tennis Legends - Having different tie-break rules between tournaments is crazy and has to change - Eurosport
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Does Australian Open final have a fifth set tie-break or do players have to win by two clear games? - Sporting Excitement
Australian Open's new tie-break rules receive lukewarm praise from Roger Federer, Angelique Kerber | Fox Sports
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