Jannik Sinner made history Monday when he climbed to No. 1 in the PIF ATP Rankings following Roland Garros.
The 22-year-old now stands at the pinnacle of the sport, which he says is "the biggest meaning we have in our sport. It's the best number you can have".
In the latest edition of ATPTour.com's 'Tuesday Trivia' series, we test your knowledge of Sinner's rise to World No. 1.
Jannik Sinner became World No. 1 for the first time on Monday 10 June. How many players have reached World No. 1?
22
24
29
Sinner is the first player from which country to climb to the pinnacle of men's tennis?
Austria
Italy
Germany
How many active players have reached World No. 1?
6
7
8
Jannik reached No. 1 based on his performance over the past 52 weeks. How many titles did he win during that time?
3
6
7
Several former No. 1s congratulated Jannik on his accomplishment. Who told him, "Here's kind of a cool way to look at it. If the universe had a tennis tournament, Earth would pick you."?
Roger Federer
Andy Roddick
Andre Agassi