Frances Tiafoe has been the life of the party so far this week at the Next Gen ATP Finals in Milan, cracking jokes and messing around with his fellow contestants.

But how well does the American actually know his rivals in the 21-and-under tournament?

We put Tiafoe to the test and he surprised us with his knowledge.

The world No. 40 begins his campaign at the Fiera Milano on Tuesday against Poland’s Hubert Hurkacz (19:30 local time, 22:30 Dubai time).