Murray and Williams take part in the third round of the mixed doubles at Wimbledon this evening, against top seeds Bruno Soares and Nicole Melichar.
They have previously coasted past both Andreas Mies and Alexa Guarachi and 14th seeds Fabrice Martin and Raquel Atawo in straight sets, despite having never played with one another before this year’s tournament.
And writing in his BBC column, 32-year-old Murray revealed one of the secrets behind their successful partnership.
“The format is good fun and the crowd love to watch it,” he wrote.
“You only see the mixed at the Slams really, but is a different format and one a lot of social tennis players play at local clubs around the country.
“Serena and I shared a few jokes out there on Tuesday night – but we can’t reveal what they were, unfortunately, because some of the language was not repeatable!
“I was feeling more relaxed than the first match and that was probably because Serena was making me laugh out there, and hitting some amazing returns.”
Williams has been similarly ebullient about their link-up, commenting earlier this week: “I am having a blast. Obviously it has been a great atmosphere playing out there with Andy, so it is great.”
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