Nicolai Budkov Kjær (born 1 September 2006) is a Norwegian professional tennis player. He has a career-high ATP singles ranking of world No. 132, achieved on 3 November 2025.[1] He is currently the No. 2 singles player from Norway.[2]
Budkov Kjær was born to a Norwegian father and an Estonian mother.[3] He has a sister who also plays tennis, Alexandra Budkova Kjær. He lives in Bygdøy, Oslo, and trains at Oslo Tennisarena and Wang Toppidrett.[4][5]
He reached an ITF junior combined ranking of world No. 1 on 15 July 2024.[9]
Professional career
2023-2024: Davis Cup debut
In September 2023, Budkov Kjær made his Davis Cup debut against Peru.[10]
In February 2024, he replaced Dominic Thiem at the Ultimate Tennis Showdown in Oslo, the ninth edition of the tournament.[11][12] The following month, he won his first professional title at the $15k Antalya Series. He subsequently made his debut in the top 1000 of the ATP rankings at world No. 897 on 8 April 2024.[1][13][14] He was the first Norwegian to do so since Casper Ruud in 2016.
Also in February, he recorded his first Davis Cup win, over Latvian Davis Rolis, and in September his second, with a win over Portuguese Jaime Faria, who was ranked No. 157 at the time.[3]
In November, Budkov Kjær defeated former Top 10 player Pablo Carreño Busta at the 2024 Montemar Challenger.[15]
2025: Four Challenger titles, ATP first win
Budkov Kjaer playing at the 2025 Wimbledon qualifying tournament
In April, ranked at a career-high of No. 287, Budkov Kjær received a wildcard for the qualifying competition at the 2025 Monte-Carlo Masters.[18][19]
In June, Budkov Kjær played his first qualifying match in a Grand Slam event and reached the second qualifying round at 2025 Wimbledon Championships.[20]
In July, Budkov Kjær made his ATP debut after qualifying for his first main draw at the 2025 Swedish Open.[21] In the first round he defeated Thiago Monteiro to grab his maiden win on the ATP Tour.[22]
Budkov Kjær earned his second Challenger title at the Tampere Open, defeating Sascha Gueymard Wayenburg in the final. As a result, he entered the top 200 at world No. 187 on 28 July 2025, rising close to 70 positions up in the singles rankings.[1][23][24] The following week he won the Astana Challenger after beating Alexandr Binda, putting him sixth in the NextGen ATP race.[25] As a result he reached a new career-high singles ranking of world No. 163 on 4 August 2025.[1]
Ranked at a career-high of No. 149, achieved on 29 September 2025, Budkov Kjær won his fourth Challenger title at the Open de Vendée, defeating Patrick Kypson in the final in 54 minutes, the shortest final in the event’s history. At 19 years old, he also become the youngest champion in the history of the tournament.[26] As a result he reached a new career-high of world No. 136 on 13 October 2025.[1]