Their surname, for one, while they are both from Switzerland and they have twins with one another.

But there is now a new thing that the pair can toast - and you are unlikely to be able to guess it.

For it has emerged this week that both Mirka and Roger feature in the top five names searched on Google in Switzerland!

Top of the pile is the 19-time Grand Slam champion, who has been the most searched Swiss personality in his country in 2017.

That follows a dream year in which he has won two Grand Slams - the Australian Open and Wimbledon - while mounting a challenge for the world No 1 spot with Rafael Nadal

Second is academic Tariq Ramadan while third is one of Federer's friends - at least off-court - in Stan Wawrinka.

Behind Wawrinka comes Roger's wife Mirka, a former tennis player herself. The pair met at the 2000 Olympics in Sydney with Mirka enjoyed a career high ranking a year later, when she got to the world No 76 spot.

However, she retired in 2002 due to a persistent foot injury but she has travelled the world with Roger since supporting him.

The pair attended Pippa Middleton's wedding to James Matthews earlier this year having tied the know themselves in 2009.

They have two sets of twins - identical girls Myla Rose and Charlene Riva and boys Leo and Lenny.