Djokovic on target for three on end

A welcome wind blew away the stifling heat at Melbourne Park yesterday, but there was no diverting Novak Djokovic or Maria Sharapova from their paths to the last 16 of the Australian Open on day five of the tournament.

Djokovic remained on course for his third straight title as he marched into the fourth round without giving up a set after successfully negotiating a tricky tie against Radek Stepanek with a 6-4 6-3 7-5 win.

Sharapova was even more impressive and, although denied a third successive 6-0 6-0 win of the week, looked every inch the title contender in her 6-1 6-3 demolition of seven-times grand slam champion Venus Williams.

Fourth seed Agnieszka Radwanska also continued her red-hot start to the year, notching up win number 12 with a 6-3 6-1 victory over Britain’s Heather Watson in their third round tie.

Playing with the roof closed on Rod Laver Arena because of a few drops of rain that accompanied the cooler weather, Djokovic had to work for every point against Stepanek, who charged the net 67 times.

It was little more than a good workout for the world No 1, however, and before launching a broadside at disgraced cyclist Lance Armstrong, he complimented the 34-year-old Czech on his contribution to the match.

‘‘He loves the big stage,’’ the Serbian said. ‘‘You saw how much fun he had. I also had a lot of fun playing. It was a very entertaining match. He’s very skilful, comes to the net, never gives you the same ball twice.’’

Sharapova’s flurry of fist pumps after she wound up her match against Williams showed how much the victory meant to the second seed, who has been in ruthless form this week despite missing her one warm-up tournament with a collar-bone injury.

‘‘I think the reason I started so well in this tournament is because I knew that I had to,’’ said the Russian 2008 champion.

‘‘I knew I was coming in without any match play. It’s tough. I hadn’t played a professional match, a real match, in over two months.’’

The absence of the injured world No 4 Rafa Nadal has left a gaping hole in the top half of the draw and fourth seed David Ferrer eased further into it with a 6-4 6-2 6-3 win over another entertainer, 2006 finalist Marcos Baghdatis.

The Spanish baseliner showed more than a few decent touches of his own – most notably a sumptuous backhand lob – as he set up a fourth-round contest against Japan’s Kei Nishikori.

Big-serving Tomas Berdych was a 6-3 6-2 6-2 winner over Jurgen Melzer and will face Kevin Anderson in the next round with a likely quarterfinal meeting with Djokovic on the line.