After struggling with illness in his opening match, the 21-year-old's throwback sports accessory helped him stay alive at the ATP Finals.

The former world No. 1 played with a sinus strip across his nose and can breathe a sigh of relief after scoring his first win of the week in Turin.

Sinner is the betting favorite; Zverev made a statement; Alcaraz is already on the brink of elimination—and keep an eye on Fritz.