Cincinnati. He subsequently reached the second round of a Grand Slam for the first time in his career at the 2020 US Open (tennis), where he defeated Aljaz Bedene in the first round, to set up a clash with Casper Ruud in the second round. He exited the tournament after retiring in the third set against Ruud. Ruusuvuori reached the semifinals in Nur-Sultan, where he lost to Adrian Mannarino. 2021: Top 70 debut, Miami Masters fourth round On March 26, 2021 Ruusuvuori scored a major upset over World No. 7 Alexander Zverev at the Miami Open for a second top-10 victory in his career. He reached the fourth round where he lost to Jannik Sinner, his best result yet at a Masters 1000 event. Ruusuvuori reached the semifinals of the 2021 Atlanta Open, beating Mackenzie McDonald, seventh seed Benoît Paire, and third seed Cameron Norrie before losing to Brandon Nakashima. He played Prajnesh Gunneswaran in the 2021 Citi Open, winning, before bowing out to Sinner in the second round. As a result he entered the top 70 at a career-high of World No. 69 on 2 August 2021. At the 2021 Winston-Salem Open, Ruusuvuori reached his third quarterfinal of the year defeating again twelfth seeded Benoît Paire, and his third tour-level semifinal in his career defeating fourteenth seed Richard Gasquet along the way. He lost to Ilya Ivashka. 2022: First ATP Tour final, top 40 debut Ruusuvuori started the year with success, reaching the semifinals of the Melbourne Summer Set 1, where he was defeated in two close sets by eventual champion Rafael Nadal. In the first round of the Australian Open, Ruusuvuori faced 9th seed Félix Auger-Aliassime in a five-set thriller, eventually losing to the Canadian despite leading 2 sets to 1, and bageling Auger-Aliassime in the 2nd set. In Pune, he reached his first career final by defeating Egor Gerasimov, Vít Kopřiva, defending champion Jiří Veselý and Kamil Majchrzak. He lost to Joao Sousa in the final in three sets. He reached a career-high of No. 63 on 25 April after successful second rounds showings at the 2022 BNP Paribas Open, the 2022 Miami Open, the 2022 Monte-Carlo Masters and a third round at the 2022 Barcelona Open Banc Sabadell. He reached the quarterfinals at the 2022 BMW Open and moved to the top 60 at World No. 59 on 2 May 2022. At the 2022 Italian Open,