No. 15 Jannik Sinner, +9 (Career-High)
The #NextGenATP Italian has jumped nine spots to a career-high No. 15 in the FedEx ATP Rankings after he captured the Citi Open title in Washington. The 19-year-old is the youngest ATP 500 champion since the category was created in 2009, with no other teen lifting a trophy at this level. The three-time tour-level titlist dropped just one set all week en route to victory. Read Washington Final Report & Watch Highlights

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No. 3 Stefanos Tsitsipas, +1 (Career-High)
Despite not playing last week, the 22-year-old has moved one place to a career-high No. 3. The Greek has won two tour-level titles this year at the Rolex Monte-Carlo Masters and the Open Parc Auvergne-Rhone-Alpes Lyon, while also advancing to his first Grand Slam final at Roland Garros in June. The 2019 Nitto ATP Finals champion is the third seed in Toronto this week.

No. 55 Kei Nishikori, +12
The 31-year-old has moved 12 places after he reached the semi-finals in Washington. It is the first time the Japanese star has reached the last four at a tour-level event since Barcelona in 2019. The former World No. 4, who lifted the Citi Open trophy in 2015, last won a tour-level title at the 2019 Brisbane International.

No. 64 Mackenzie McDonald, +43
After advancing to his first ATP Tour final at the Citi Open, the American has risen 43 spots to No. 64 in the FedEx ATP Rankings. The 26-year-old defeated Australian Nick Kyrgios and Nishikori in Washington.

No. 97 Jenson Brooksby, +33
The #NextGenATP American has broken into the Top 100 for the first time, climbing 33 spots to No. 97 after reaching the semi-finals in Washington on his ATP 500 debut. The 20-year-old recorded a career-best win at the Citi Open, overcoming World No. 15 Felix Auger-Aliassime in the third round. 

Other Notable Top 100 Movers
No. 32 Reilly Opelka, +4
No. 36 Marton Fucsovics, +2
No. 40 Taylor Fritz, +2
No. 90 Denis Kudla, +13