The Latest: Isner loses to Opelka in 4-tiebreaker matchup

5 p.m.

Katie Boulter started celebrating a bit too soon during her first-round win over Ekaterina Makarova at Melbourne Park. Blame the new tiebreaker being used for the first time this year at the tournament.

Boulter beat Ekaterina Makarova 6-0, 4-6, 7-6 (6), including 10-6 in the tiebreaker. But the British player started celebrating and went to the net when she reached 7-4 in the tiebreaker , forgetting the third-set decider wasn't using a conventional count.

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