Swiss duo Roger Federer and Belinda Bencic have teamed up well thus far at the Hopman Cup in Perth.
However, how well do they know each other?
The Switzerland pairing have been set a series of questions about their partner.
Bencic was just six-years-old when Federer won his first Grand Slam in 2003, so there is a bit of an age gap in the Swiss ranks.
Here they are taking on Teammate Trivia…