Roger Federer watches the protestors being taken away

After a streaker interrupted Maria Sharapova's match on Tuesday, two fathers' rights campaigners halted Roger Federer's match on Wednesday.

Spectators already face bag searches before entering the grounds but tougher measures could now be introduced.

A Wimbledon spokesman said: "Putting fences up is not something we want to see. But it is an option."

In the middle of defending champion Federer's quarter-final against Mario Ancic two men, protesting about lack of access to their children, leapt on to the court and started an impromptu rally.

It will be a shame if a few selfish idiots were to ruin it for everyone and we have to put permanent measures in place to prevent people gaining access to the court Wimbledon statement

One served a tennis ball towards the Royal Box, while the other stood on the opposite side of the net before security men rushed onto court and ushered them off.

A police spokesman confirmed that the men had been arrested.

The incident followed Dutch DJ Sander Lantinga's leap onto Centre Court the previous day when he performed a nude cartwheel close to Russian star Sharapova.

The latest Centre Court intrusion provoked a frosty response from the All England Club.

"It will be a shame if the antics of a few selfish idiots were to ruin it for everyone in the future and it meant we have to put more permanent measures in place to prevent people gaining access to the court," the club spokesman added.

"The security operation at Wimbledon starts outside the grounds with the X-ray searching of bags, electronic detector arches and body searching.

"It is a tough compromise between containment and allowing the great views and closeness to the action that spectators have traditionally enjoyed.

"In this case, it was quickly apparent that the individuals posed no threat to the players or the public, and the incident was dealt with summarily and swiftly."