and claim the title. In November, Ruusuvuori competed in two Futures events: Estonia F4 in Pärnu and Finland F4 in Helsinki. As a wildcard entry in Pärnu, he defeated third seed Vladimir Ivanov of Estonia en route to his third quarterfinal showing of the year. On the ITF Pro Circuit, Ruusuvuori won his first Futures championship at the Finland F4 event. Again as a wildcard entry, the competition in Helsinki saw Ruusuvori's best singles result to date. Defeating the 8th, 4th, and 1st seeds en route to the final, Ruusuvuori then defeated 3rd seeded Evgeny Karlovskiy of Russia in three sets, 4–6, 6–0, 6–1, to win his first Futures singles event of his career. In doubles, he and fellow Finnish player Patrik Niklas-Salminen reached the quarterfinals. Through a successful 2017, Ruusuvuori reached a high Junior ranking of World No. 4 in the ITF combined junior rankings and finished the year ranked No. 665 in the ATP singles rankings. He finished his junior career with a win–loss record of 99–44. Junior Grand Slam results - Singles: Australian Open: QF (2017) French Open: 1R (2017) Wimbledon: 1R (2017) US Open: SF (2017) Professional career 2018: First Challenger main draw Ruusuvuori's year began at the Hong Kong F6 Futures, held the first week of January. Seeded 7th in singles, he reached the quarterfinals before losing to 4th seeded Shintaro Imai of Japan in two sets. The next week, Ruusuvuori reached his first Challenger event main draw, coming through qualifying to reach the second round of the Bangkok Challenger. Ruusuvuori again represented his home country in the Davis Cup in February, going 1–1 in singles to help Finland advance over Tunisia 3–2. 2019: Raise in rankings, Top 125 debut, First top-10 win Ruusuvuori drastically improved his ATP ranking in 2019 as he had risen from 385 at the beginning of the year to 123 at the end. Ruusuvuori also made and won his first challenger final in April 2019 and would go on to win 3 of 4 more challenger finals. In September 2019, Ruusuvuori stunned World No. 5 and 2-time French Open finalist Dominic Thiem in straight sets in a Davis Cup match against Austria for his first top-10 win. 2020: Top 100 & Grand Slam debut, First ATP Tour semifinal Ranked at No. 100, Ruusuvuori made his Masters debut and reached the second round at the 2020 Western & Southern Open in