Becker amazed by Djokovic's 'incredible' year

Three-time Wimbledon champion Boris Becker admits that he has never seen a player enjoy as consistent a season as Novak Djokovic has this year.

The Serbian world number one has 64 wins from 67 matches so far in 2011.

Becker, who is in London attending the Laureus Sport for Good Summit, also says that the tennis calendar is too long and puts players under "enormous stress" as talk grows of a players strike.