Since becoming a father of twin girls in July, world tennis number one Roger Federer, currently in New York for the US Open, says he has developed a new hobby: walking.

Although he has yet to go for family strolls through Central Park, the Swiss star says he, wife Mirka and daughters Charlene and Myla have been able to wind their way through the Big Apple's bustling streets without being hassled.

"We don't need a bodyguard," he said. "People respect you when you're with babies and they leave you in peace. Sure, people turn around – but only because they don't see twins every day..."

In his bid for a sixth consecutive US Open title – on Saturday he faces 2001 champion Lleyton Hewitt in the third round – Federer is being supported by his parents, wife – and an English nanny. "They're said to be the best," he said with a smile.

"I don't know how long we'll keep her, but she's excellent – and it's a very intimate job. With our lifestyle, it wouldn't be possible without her. And twins need extra attention as it is."

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