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Casper Ruud will climb to World No. 1 on Monday if he wins the US Open title.

Battle For World No. 1 At US Open Down To Ruud & Alcaraz

Nadal eliminated from contention

The battle for No. 1 in the Pepperstone ATP Rankings at the US Open is down to two players: Casper Ruud and Carlos Alcaraz.

When Ruud defeated Karen Khachanov in the US Open semi-finals, he eliminated Rafael Nadal from contention. Alcaraz ousted Tiafoe in tonight's second semi-final, making Sunday’s final a winner-takes-all-clash for a Grand Slam trophy and World No. 1.

Pepperstone ATP Live Rankings Round By Round

 Player  F  Title
 Casper Ruud
 5,850  6,650
 Carlos Alcaraz  5,940  6,740

Alcaraz, who is only 19, is No. 1 in the Pepperstone ATP Live Rankings. Ruud, who entered the tournament as World No. 7, is currently No. 2 in the Pepperstone ATP Live Rankings.

Alcaraz is trying to become the youngest No. 1 in Pepperstone ATP Rankings history. The teen can break the mark set by Lleyton Hewitt, who was 20 when he became World No. 1 in 2001. Ruud is trying to become the first Norwegian to capture the top spot.