Hawk-Eye's analysis added to the excitement at Wimbledon

Federer, who won a fifth straight men's singles title on Sunday, has doubts over the accuracy of the ball-tracking system used to settle disputed calls.

He lost his temper during Sunday's win against Rafael Nadal over one Hawk-Eye judgement which went against him.

But a Wimbledon spokesman said: "It's been an overwhelming success and it will be here to stay."

He added: "From what we can see it was welcomed warmly by spectators as part of the entertainment... and with very few exceptions it was also welcomed by the players.

"We feel it has worked very well and matched our expectations."

Hawkeye demonstrated the high level of accuracy of the linesmen and women because most of the challenges went against the player aming them.

Wimbledon statistics showed that on only four of the first 12 days on Centre Court did the challenge success rate reach 50% or more.

Fears that players, who were allowed three unsuccessful challenges per set, would abuse the system to disrupt their opponents were also unfounded, with an average of just 1.16 challenges per set played.