The video says it all. During a group match between Switzerland and the USA in the Hopman Cup in Perth in the first week of January, Roger Federer and Jack Sock may have, er, forgotten that they were playing a mixed doubles match.
As the male players exchanged shots in a prolonged rally, their female partners, Belinda Bencic and CoCo Vandeweghe, respectively, probably began to wonder what they were doing on court. And acted accordingly.
On Twitter opinion was divided as some saw it as misogyny and others as some harmless fun.