Venus Williams got the better of her younger sister Serena to make it through to the fourth round at Indian Wells with a 6-3 6-4 win.
Serena was playing in her first tournament since giving birth last September and faced her sister for the 29th time, with Venus winning all but four of their meetings.
Serena saved three break points to hold her first service game but lost her third to love as Venus took a 4-2 lead and served out for the set in 37 minutes.
Venus raced to a 3-0 lead in the second set after breaking her sister twice and had a match point at 5-3 which Serena saved, before Venus saved a break point of her own at 5-4 and went on to take the match.
The number eight seed will go on to face Latvian Anastasija Sevastova who beat Julia Goerges in straight sets 6-3 6-3.
Second seed and Australian Open champion Caroline Wozniacki is through to the fourth round after seeing off Aliaksandra Sasnovich 6-4 2-6 6-3, while US Open champion Sloane Stephens lost to Daria Kasatkina 6-4 6-3.
Novak Djokovic lost on his return to competitive tennis to Taro Daniel in the BNP Paribas Open at Indian Wells.
Daniel, ranked 109 in the world, claimed the biggest win of his career as the qualifier prevailed 7-6 (7/3) 4-6 6-1.
Japan's Daniel won the first set on a tie-break before Djokovic, making his return from an elbow injury, took the second.
However, 25-year-old Daniel dominated the third and final set to take it 6-1.
Daniel, who beat Britain's Cameron Norrie in the first round, will meet Leonardo Mayer, who beat Ruben Bemelmans 6-4 6-1.
British number one Kyle Edmund was beaten in straight sets by Israel's Dudi Sela 6-4 6-4 in his first match since reaching the Australian Open semi-finals.
Edmund, who has been out of action with a hip injury since his brilliant performance in Melbourne, led 3-1 in the opening set and had two break points to go further ahead.
However, world number 97 Sela dug deep to hold serve and immediately broke Edmund to get back on level terms before another break in the 10th game secured the set.
Sela also took the second set by the same score to seal a 6-4 6-4 victory in 91 minutes against world number 24 Edmund, who replaced the injured Andy Murray as British number one earlier this month.
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Roger Federer maintained his record of never having lost an Australian Open quarter-final by beating Tomas Berdych in Melbourne for the third consecutive year.
The defending champion was a straight-sets winner over his Czech rival in the quarter-finals in 2016 and the third round last year, and it was the same again here as Federer won 7-6 (7/1) 6-3 6-4 to set up a clash with exciting young Korean Chung Hyeon.
Things might have been different had Berdych converted his fine start into the opening set, as he probably should have.
The Czech raced into a 3-0 lead and served for it at 5-3. Federer was unhappy with a Hawk-Eye challenge that was not shown on screen because of a technical malfunction and had a long and testy conversation with the umpire.
But being fired up helped the 36-year-old, who saved a set point, broke back and then saved a second set point in the following game.
Once he raced through the tie-break, there only looked like being one winner and he wrapped up victory after two hours and 14 minutes, maintaining his record of not having dropped a set all tournament.
It is the eighth time he has beaten Berdych out of 10 slam meetings and a ninth consecutive victory overall against the Czech, who has arguably suffered most of all from the dominance of the 'big four'.
Federer's career statistics continue to get more remarkable, with 2015 the only time since 2003 that he has failed to reach the last four in Melbourne.
He said of the first set: "I hung around, had to get a bit lucky, a bit angry, a bit frustrated maybe but I actually thought the call was good anyway. It's all good. I'm very happy I got out of that first set, it ended up being the key to the match. Tomas played great. I stole that one a little bit."
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Marin Cilic will play Kyle Edmund in the semi-finals of the Australian Open after Rafael Nadal retired during the deciding set of their clash with a hip problem.
The world number one looked to be on his way to yet another grand slam semi-final when he moved two sets to one in front but he called for the trainer after going a break down in the fourth set.
Nadal took a medical time-out but was clearly hampered in his movement and, after limping around the court for two games at the start of the fifth set, he headed to the net to shake hands.
The 3-6 6-3 6-7 (5/7) 6-2 2-0 victory gave Cilic a first victory over Nadal since 2009 and sent him through to his first Australian Open semi-final since defeat by Andy Murray in 2010.