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Follow live: Nadal, Zverev going the distance at Aussie Open

Rafael Nadal battles back to take the fourth set against Alexander Zverev and send it into a decider. Earlier, Serena Williams secured a straight-set win over Nicole Gibbs.

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1dPeter Bodo

What is slowing down Ivo Karlovic?

The 37-year-old's results and number of aces (75 in the first round) would strongly suggest that nothing is slowing Dr. Ivo down. Not even his age.

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Cahill: Future bright for Aussie men (1:14)
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WATCH - Bahrami jokes around with McEnroe (0:48)
Clive Brunskill/Getty Images
2dMatt Westby

Murray's route to Aussie Open title

With Novak Djokovic already out, Andy Murray is favoured to finally land the Australian Open crown. Find out whom he'll have to beat to lift the trophy.

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WATCH - Aussie fans bring the noise (0:34)
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Djokovic under pressure heading into French Open? (1:41)
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WATCH - Djokovic's shock defeat (1:36)
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Is the path now clear for Nadal with Djokovic out? (1:09)
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Monfils casually goes behind-the-back for set point (0:28)
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Istomin: 'I feel sorry for Novak, I was playing so good today' (1:39)
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Serena cruises to second round Australian Open win (0:50)
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2dPeter Bodo

Do Grand Slam wild cards reward mediocrity?

Grand Slam wild cards were introduced with the best of intentions. But the truth is that their entry into these events is taking opportunities away from more deserving players.

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Rowdy Baghdatis fans asked to leave (0:45)
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Murray, Lendl brave the heat during serving practice (0:35)
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WATCH - Grooving out at the Aussie Open (0:26)
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Konta explains her Aussie moth encounter (0:26)

Now

Matt Wilansky ESPN.com 

There's invariably chatter about the next-big thing in tennis. And we've seen a lot of touted players disappoint. But there's something different about 19-year-old Alexander Zverev, who has just taken a 2 sets to 1 lead against Rafael Nadal. The 6-foot-6 teenager has some of the hardest groundstrokes you'll ever see.

ESPNTennis @ESPNTennis

Some big backhands from 19yo Zverev and he captures the 3rd 7-6(5) to take two sets to one lead over 2009 champion Nadal. #AusOpen

Matt Wilansky ESPN.com 

A day-session record 58,355 fans today at Melbourne Park.

Matt Wilansky ESPN.com 

Do we have another upset brewing? Alexander Zverev, who's been touted as a future star, took the first set from Rafael Nadal, 6-4, at the Aussie Open. Rafa is 25-27 in majors when dropping the opening frame.