Federer Opens Australian Open With Win (Getty Images)

Former world number one Roger Federer has advanced to the second round of the Australian Open with a four-set victory over Austria’s Jurgen Melzer in Melbourne.

The four-time champion, in his first competitive match in six months after injuring his knee, won 7-5 3-6 6-2 6-2.

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To meet America’s Rubin

The 35-year-old, who hit 19 aces in his two-hour match against Melzer, faces 20-year-old American Noah Rubin in round two.

Meanwhile, world number four Stanislas Wawrinka endured a difficult game before seeing off Slovakia’s Martin Klizan 4-6 6-4 7-5 4-6 6-4.

Also, Japan’s Kei Nishikori booked his place in the next round. The world number five overcame Russia’s Andrey Kuznetsov 5-7 6-1 6-4 6-7 (6-8) 6-2.

He will next step onto the court against France’s Jeremy Chardy while Wawrinka will face American Steve Johnson.