Alex T. Michelsen (born August 25, 2004) is an American professionaltennis player. He has a career-highATP singles ranking of world No. 30, achieved on 14 July 2025, and a best doubles ranking of No. 67, achieved on 30 June 2025.[2] He is currently the No. 7 American singles player.
In August 2022, Michelsen reached his firstITF tour final in doubles at the M15 Memphis, teaming withCooper Williams. He then made his Grand Slam doubles debut at theUS Open playing alongsideSebastian Gorzny, losing in the first round.
In November 2022, Michelsen won his first titles on the ITF Tour inEast Lansing. He swept the event, defeating Alexander Kotzen in the singles final, and partnering withLearner Tien to win the doubles event.[6]
2023: ATP Tour, major & top 100 debuts, first ATP Tour final
In June, he made his ATP debut at the2023 Mallorca Championships as a lucky loser, losing in the first round to eventual championChristopher Eubanks.[8]In July, Michelsen won his first Challenger title inChicago, defeatingYuta Shimizu in the finals.Later that month, he reached his first final on theATP Tour at the2023 Hall of Fame Open in Newport,[7] where he lost to second seedAdrian Mannarino.[9] With this run, he tiedJohn Isner as the fastest American man to reach an ATP Tour level final, doing so in just his second ATP tournament,[10] and at 18 years 10 months, became the youngest American man to reach a final sinceTaylor Fritz.[11]
Michelsen turned professional two weeks later, foregoing his college eligibility[5] and in August, he made his debut at a Major when he received a wildcard into themen's singles event at theUS Open.[12] He defeatedAlbert Ramos Viñolas in straight sets to progress to the second round where he lost to 23rd seedNicolás Jarry.[13] As a result, he reached a new career high of No. 117 on 11 September 2023. At the same tournament, he also enters the mixed doubles competition withRobin Montgomery and reached the second round on his debut.
He reached the third round at the2024 Australian Open defeating wildcardJames McCabe and 32nd seedJiří Lehečka on his debut at this major. As a result, he reached the top 75 in the singles rankings.[18]
At the2024 Dallas Open, he defeated qualifierTennys Sandgren but lost to top seedFrances Tiafoe.[19][20] The following week at the2024 Delray Beach Open,[21][22] he defeatedThanasi Kokkinakis in straight sets.[23][24] He lost to Dallas championTommy Paul in a tight match with a third set tiebreak.[25] At the next tournament, the2024 Los Cabos Open, in the following week, he entered as an alternate and defeated another alternate playerConstant Lestienne. He recorded the biggest win and first top 10 win of his career, defeating newly arrived top 10 player and the fourth seed, previous year runner-upAlex de Minaur in straight sets, losing only five games, to reach the quarterfinals.[26][27] He lost to eventual championJordan Thompson after winning the first set 6-0 and having three match points.[28]
At the2024 BNP Paribas Open, he recorded his first Masters win overJaume Munar on his debut.[29] At the age of 19, he became the youngest American player to win a match at this level sinceTaylor Fritz andFrances Tiafoe were both winners at that same age in Miami in 2017.[30][31] He lost again to fellow American, 17th seed Tommy Paul. He also made his debut at the2024 Miami Open and recorded his first win over qualifierLukáš Klein in straight sets.[32]
He recorded his first ATP clay court win at the2024 BMW Open in Munich with a win over wildcardMax Hans Rehberg.[33] He reached the top 65 on 20 May 2024, following his first round losses at the2024 Mutua Madrid Open and at theItalian Open and a second round loss at the Challenger2024 Open de Oeiras II. A week later he entered the top 60 after reaching his first ATP clay court quarterfinal with a win over third seed and compatriotTaylor Fritz at the2024 Geneva Open, his second top 15 win.[34]
With his first grass court win of the season overNuno Borges inMallorca, he became the youngest player to win a match at the tournament. As a result, he reached the top 55 in the singles rankings.[8]Michelsen reached a consecutive final at the2024 Hall of Fame Open, defeatingReilly Opelka in the semifinals[35][36] before losing toMarcos Giron.[37]
At the2025 Australian Open, Alex Michelsen faced again 11-seed Stefanos Tsitsipas and won in four sets to secure his first top 15 win in a major.[46][47] Next he defeated local wildcardJames McCabe and 19th seedKaren Khachanov to reach a Grand Slam fourth round for the first time in his career.[48]
At the2025 BNP Paribas Open, where he was seeded for the first time at a Masters 1000, he reached the third round at that level for the first time, defeating qualifierColton Smith but retired in his next match againstDaniil Medvedev.[49][50] InMiami, he lost in the second round, having had a bye in the first.[51]
Michelsen reached the top 30 on 14 July 2025, followingWimbledon. Ranked No. 34 at the2025 National Bank Open, he reached a Masters 1000 fourth round for the first time in his career upsetting world No. 10 and third seedLorenzo Musetti.[52] Next he defeated good friendLearner Tien in straight sets to reach his first Masters 1000 quarterfinal, becoming the youngest American player at 20 years and 336 days, to accomplish the feat at the Canada Masters sinceAndy Roddick (at 18 years 334 days) in 2001.[53][54][55]
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United States
Mackenzie McDonald
Marcelo Arévalo
Mate Pavić
André Göransson
Kevin Krawietz
Adrian Mannarino
Lorenzo Sonego
Santiago González
Jordan Thompson
Yuta Shimizu
Toby Samuel
Finn Reynolds
Juan Martín del Potro
João Fonseca
Daniel Vallejo
Coleman Wong
