Both have spent 66 weeks as world No. 1, but Sunday's winner will break the tie.

The other two are just as compelling, with Sinner facing Auger-Aliassime and De Minaur meeting hometown hero Vacherot.

Driven out of her homeland by Russian bombs in 2022, the teen would find safety in the U.S., and a refuge on tennis courts in The Bronx.

Which player will walk away with the No. 1 ranking at tournament's end?

A 24-0 record in sets, servebot-level numbers, and a Sunshine Double will do that.

“I was trying to remind myself I’m strong enough to handle that," the world No. 1 said on Tennis Channel after a tense three-set win.

The head-to-head is 6-6, and this will be their first encounter in what is essentially the American's hometown tournament.

The first encounter presents an unexpected semifinal; the second is a Sunshine Double sequel.

Before that semifinal goes down Thursday evening, Jannik Sinner takes on Frances Tiafoe and Coco Gauff faces Karolina Muchova.

Plus, breaking down Tommy Paul vs. Arthur Fils, and Jiri Lehecka vs. Martin Landaluce in the quarterfinals.

Plus, previewing the Karolina Muchova vs. Victoria Mboko and Coco Gauff vs. Belinda Bencic quarterfinals.