Australian Open: Roger Federer - 'I need to be pushed'

Photos: Tennis great hires new coach
At the end of 2015, Roger Federer split with coach Stefan Edberg after two years working together. The Swiss said of the Swedish coach -- himself a six-time major winner -- in a statement: "You were an invaluable coach for two years & will be my idol for life."
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Photos: Tennis great hires new coach
Federer won 11 ATP titles in the two years he worked with Edberg, and lost three grand slam finals -- all to Novak Djokovic. Edberg said he had only initially intended to work with Federer for one year before agreeing to extend that through to the end of 2015.
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Photos: Tennis great hires new coach
The 17-time grand slam champion has now hired his former on-court rival Ivan Ljubicic, who had been coaching top-10 player Milos Raonic of Canada.
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Photos: Tennis great hires new coach
Federer said ahead of the 2016 Australian Open, his first grand slam with Ljubicic: "I always believe there's new things you can learn, but there's always sometimes a way of staying motivated, staying hungry. Someone like Ivan can also help do that."
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Photos: Tennis great hires new coach
Ljubicic is one of many former stars coaching today's biggest players. Boris Becker has been working with world No. 1 Djokovic since December 2013, in which time the Serbian has won four grand slam titles to take his overall tally to 10.