I'm still a force to be reckoned with: Roger Federer warns Rafael Nadal and Novak Djokovic

Seventeen-time Grand Slam-winner Roger Federer has warned arch rivals Rafael Nadal and defending champion Novak Djokovic that he is still a force to be reckoned with as they head into the Australian Open.

Armed with a new, bigger racquet and with Stefan Edberg as coach, Federer, 32, is currently ranked World Number six, and is hoping to improve on his record of only one Grand Slam title - Wimbledon - in the last four years, reports the Dwan.

He also said that he was excited about Edberg agreeing to coach him.

Federer won the Australian Open in 2004, 2006, 2007, 2010, and has not failed to reach the semi-finals since 2003.

He will be competing in a record 57th consecutive Grand Slam tournament, beating the mark of 56 set by South Africa's Wayne Ferreira.

The Swiss great begins his tournament against Australian hope James Duckworth, with Jo-Wilfried Tsonga, Andy Murray, Rafael Nadal and Novak Djokovic all lurking as potential opponents.