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Reilly Opelka (born 28 August 1997) is an American professional tennis player. At , he is tied (with Ivo Karlović) for the tallest-ever ATP-ranked player, and can produce serves that measure over . He has been ATP rankings as high as world No. 17 in singles by the ATP, which he achieved on February 28, 2022, and in doubles as world No. 89 on August 2, 2021. He has won four ATP singles titles and one doubles title. He won the junior Wimbledon championship in 2015.
In 2017, Opelka got off to a good start to the season by qualifying for the Australian Open. He played No. 11 seed David Goffin in the first round and pushed him to five sets before taking the loss. At the Memphis Open, he recorded his only ATP Tour level win of the year over fellow Next Gen American Jared Donaldson.
On the ATP World Tour, he reached the quarterfinals at the Delray Beach Open, picking up his first top 10 win of his burgeoning career, defeating world No. 8, Jack Sock, in the second round.
His solid performance on the ATP Challenger Tour earned him his first top-100 year-end finish in singles, ending the season at world No. 99.
In Rome, Opelka beat Richard Gasquet, Lorenzo Musetti, Aslan Karatsev and Federico Delbonis to reach his first Masters semifinal, where he lost to Rafael Nadal.
Seeded 32nd at the French Open, Opelka beat clay-court specialists Andrej Martin and Jaume Munar to reach the third round, his best showing at this Grand Slam event, where he lost to Daniil Medvedev.
Partnering Jannik Sinner, he won his first doubles title at the Atlanta Open defeating Steve Johnson and Jordan Thompson. As a result, he entered the top 100 in doubles at No. 89 on August 2, 2021. At the same tournament in singles he fell in the quarterfinals to Taylor Fritz.
At the Canada Masters in Toronto, he reached his second Masters 1000 semifinal by defeating Nick Kyrgios, 14th seed Grigor Dimitrov, Lloyd Harris and 10th seed Roberto Bautista Agut. He then upset 3rd seed and world No. 3, Stefanos Tsitsipas, to reach his first ATP Masters 1000 final. It was also his first win over a top 5 player. Opelka would lose to 1st seed and world No. 2 Daniil Medvedev in the final. With this successful run, he entered the top 25 in the ATP singles rankings for the first time at world No. 23 on August 16, 2021.
At the US Open, Opelka reached the fourth round of a Major for the first time in his career. There, he lost to Lloyd Harris in four sets. From this run, he cracked the top 20 in the ATP singles rankings for the first time at world No. 19 on September 13, 2021.
At the Indian Wells Open he reached the fourth round for the first time in his career at this Masters where he lost to fourth seed Rafael Nadal. At the 2022 U.S. Men's Clay Court Championships, Opelka won his second title of the year and fourth of his career, defeating compatriot John Isner in what was the tallest ATP Tour final in the Open Era. At the Madrid Open Opelka lost to Sebastian Korda. The Italian Open saw a defeat to Stan Wawrinka, and at the 2022 French Open to Filip Krajinović, with all losses being in the first round.
After another 8 months hiatus, he returned in mid July 2024 to the ATP Tour with a wildcard main draw entry into the 2024 Hall of Fame Open and defeated Constant Lestienne in three sets in the opening round to secure his first victory at that level for two years. Opelka continued his comeback with a victory over top seed Adrian Mannarino in round two. In the quarterfinals he defeated Mackenzie McDonald in three sets to become the lowest ranked player in history to make an ATP level semifinal where his run came to an end against Alex Michelsen. As a result he moved more than 750 positions up into the top 430 on 22 July 2024. Ranked No. 371, he received main draw wildcards for the Washington Open where he reached the second round, and for the Cincinnati Open.
He reached his first final since Houston in 2022 at the 2025 Brisbane International with an upset over top seed Novak Djokovic in the quarterfinals (his eighth top-10 win), and then over Giovanni Mpetshi Perricard, recording his 100th career win and returning to the top 200 in the rankings to world No. 171. He was the second lowest-ranked player to defeat Djokovic after Filip Krajinovic. He was forced to retire in the final against Jiří Lehečka, citing back issues.
Despite these injury concerns, he made a victorious start at the 2025 Australian Open, defeating Belgian Gauthier Onclin. He lost to Tomáš Macháč in five sets in the second round.
At the 2025 Libéma Open Opelka reached the semifinals as a lucky loser, defeating top seed Daniil Medvedev, after three consecutive double faults from the Russian in the last three service points of the deciding tiebreak. He was the second lucky loser to advance to the 's-Hertogenbosch semifinals after Rinky Hijikata in 2023.
| Grand Slam tournaments | ||||||||||||||
| Australian Open | A | A | 1R | Q1 | 2R | 1R | 2R | 3R | A | A | 2R | 0 / 6 | 5–6 | |
| French Open | A | A | Q3 | Q2 | 1R | 1R | 3R | 1R | A | A | 2R | 0 / 5 | 3–5 | |
| Wimbledon | A | A | Q1 | Q2 | 3R | NH | 1R | 2R | A | A | 2R | 0 / 4 | 4–4 | |
| US Open | Q2 | Q2 | Q2 | Q1 | 2R | 1R | 4R | A | A | 1R | 0 / 4 | 4–4 | ||
| Win–loss | 0–0 | 0–0 | 0–1 | 0–0 | 4–4 | 0–3 | 6–4 | 3–3 | 0–0 | 0–1 | 3–3 | 0 / 19 | 16–19 | |
| ATP 1000 tournaments | ||||||||||||||
| Indian Wells Open | A | A | 1R | 1R | 1R | NH | 3R | 4R | A | A | 1R | 0 / 6 | 3–6 | |
| Miami Open | A | A | Q2 | Q1 | 3R | NH | 2R | 2R | A | A | 3R | 0 / 4 | 4–4 | |
| Monte-Carlo Masters | A | A | A | A | A | NH | A | A | A | A | A | 0 / 0 | 0–0 | |
| Madrid Open | A | A | A | A | 2R | NH | 1R | 1R | A | A | 2R | 0 / 4 | 2–4 | |
| Italian Open | A | A | A | A | Q2 | A | SF | 1R | A | A | 1R | 0 / 3 | 4–3 | |
| Canadian Open | A | A | 1R | A | A | NH | F | A | A | A | 0 / 2 | 5–2 | ||
| Cincinnati Open | A | 2R | Q1 | A | 2R | QF | 2R | A | A | 1R | 0 / 5 | 6–5 | ||
| Shanghai Masters | A | A | A | A | 2R | NH | A | 1R | 0 / 2 | 1–2 | ||||
| Paris Masters | A | A | A | A | A | A | 2R | A | A | A | 0 / 1 | 1–1 | ||
| Win–loss | 0–0 | 1–1 | 0–2 | 0–1 | 5–5 | 3–1 | 12–7 | 2–4 | 0–0 | 0–2 | 3–4 | 0 / 27 | 26–27 | |
| Career statistics | ||||||||||||||
| Tournaments | 0 | 5 | 8 | 2 | 22 | 9 | 21 | 17 | 0 | 8 | 14 | Career total: 105 | ||
| Titles | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 2 | 0 | 0 | 0 | Career total: 4 | ||
| Finals | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 3 | 0 | 0 | 1 | Career total: 7 | ||
| Overall win–loss | 0–0 | 5–5 | 1–8 | 2–2 | 27–23 | 12–8 | 21–23 | 21–15 | 0–0 | 7–8 | 18–14 | 4 / 105 | 114–106 | |
| Win % | Career total: | |||||||||||||
| Year-end ranking | 981 | 204 | 229 | 99 | 36 | 39 | 26 | 38 | 1146 | 293 | ||||
| Loss | 2021 | Canadian Open | Hard | Daniil Medvedev | 4–6, 3–6 |
| {class=wikitable style=font-size:90% !Legend |
| Grand Slam (0–0) |
| ATP 1000 (0–1) |
| ATP 500 (0–0) |
| ATP 250 (4–2) |
| Hard (3–3) |
| Clay (1–0) |
| Grass (0–0) |
| Outdoor (2–3) |
| Indoor (2–0) |
| Win | 1–0 | New York Open, United States | ATP 250 | Hard (i) | Brayden Schnur | 6–1, 6–7(7–9), 7–6(9–7) | |
| Win | 2–0 | Delray Beach Open, United States | ATP 250 | Hard | Yoshihito Nishioka | 7–5, 6–7(4–7), 6–2 | |
| Loss | 2–1 | Canadian Open, Canada | ATP 1000 | Hard | Daniil Medvedev | 4–6, 3–6 | |
| Win | 3–1 | Dallas Open, United States | ATP 250 | Hard (i) | Jenson Brooksby | 7–6(7–5), 7–6(7–3) | |
| Loss | 3–2 | Delray Beach Open, United States | ATP 250 | Hard | Cameron Norrie | 6–7(1–7), 6–7(4–7) | |
| Win | 4–2 | U.S. Men's Clay Court Championships, United States | ATP 250 | Clay | John Isner | 6–3, 7–6(9–7) | |
| Loss | 4–3 | Brisbane International, Australia | ATP 250 | Hard | Jiří Lehečka | 1–4 ret. |
| {class=wikitable style=font-size:90% !Legend |
| Grand Slam (0–0) |
| ATP 1000 (0–0) |
| ATP 500 (0–2) |
| ATP 250 (1–1) |
| Hard (1–2) |
| Clay (0–0) |
| Grass (0–1) |
| Outdoor (1–1) |
| Indoor (0–2) |
| Loss | 0–1 | Swiss Indoors, Switzerland | ATP 500 | Hard (i) | Taylor Fritz | Jean-Julien Rojer Horia Tecău | 5–7, 3–6 | |
| Loss | 0–2 | New York Open, United States | ATP 250 | Hard (i) | Steve Johnson | Dominic Inglot Aisam-ul-Haq Qureshi | 6–7(5–7), 6–7(6–8) | |
| Loss | 0–3 | Queen's Club Championships, United Kingdom | ATP 500 | Grass | John Peers | Pierre-Hugues Herbert Nicolas Mahut | 4–6, 5–7 | |
| Win | 1–3 | Atlanta Open, United States | ATP 250 | Hard | Jannik Sinner | Steve Johnson Jordan Thompson | 6–4, 6–7(6–8), 10–3 |
| {class=wikitable style=font-size:97% !Legend |
| ATP Challenger Tour (4–2) |
| ITF Futures (0–0) |
| Hard (3–2) |
| Clay (1–0) |
| Grass (0–0) |
| Carpet (0–0) |
| Win | 1–0 | Charlottesville Men's Pro Challenger, US | Challenger | Hard (i) | Ruben Bemelmans | 6–4, 2–6, 7–6(7–5) | |
| Win | 2–0 | BNP Paribas Primrose Bordeaux, France | Challenger | Clay | Grégoire Barrère | 6–7(5–7), 6–4, 7–5 | |
| Loss | 2–1 | Oracle Challenger Series – Chicago, US | Challenger | Hard | Denis Istomin | 4–6, 2–6 | |
| Loss | 2–2 | Cary Challenger, US | Challenger | Hard | James Duckworth | 6–7(4–7), 3–6 | |
| Win | 3–2 | Knoxville Challenger, US | Challenger | Hard (i) | Bjorn Fratangelo | 7–5, 4–6, 7–6(7–2) | |
| Win | 4–2 | Champaign–Urbana Challenger, US | Challenger | Hard (i) | Ryan Shane | 7–6(8–6), 6–3 |
| {class=wikitable style=font-size:97% !Legend |
| ATP Challenger Tour (0–0) |
| ITF Futures (0–1) |
| Hard (0–1) |
| Clay (0–0) |
| Grass (0–0) |
| Carpet (0–0) |
| Loss | 0–1 | F24 Claremont, United States | Futures | Hard | Deiton Baughman | Dennis Nevolo Jeff Dadamo | 2–5 ret. |
| Win | 2015 | Wimbledon | Grass | Mikael Ymer | 7–6(7–5), 6–4 |
| Loss | 2015 | Wimbledon | Grass | Akira Santillan | Sumit Nagal Lý Hoàng Nam | 6–7(4–7), 4–6 |
| Wins | 1 | 3 | 2 | 1 | 0 | 0 | 0 | 1 | 8 |
| 2018 | |||||||
| 1. | Jack Sock | 8 | Delray Beach Open, United States | Hard | 2R | 4–6, 7–5, 6–3 | 228 |
| 2019 | |||||||
| 2. | John Isner | 10 | Australian Open, Australia | Hard | 1R | 7–6(7–4), 7–6(8–6), 6–7(4–7), 7–6(7–5) | 97 |
| 3. | John Isner | 9 | New York Open, United States | Hard (i) | SF | 6–7(8–10), 7–6(16–14), 7–6(7–4) | 89 |
| 4. | Roberto Bautista Agut | 10 | Swiss Indoors, Switzerland | Hard (i) | QF | 6–3, 3–6, 6–3 | 37 |
| 2020 | |||||||
| 5. | Matteo Berrettini | 8 | Cincinnati Open, United States | Hard | 3R | 6–3, 7–6(7–4) | 39 |
| 6. | Daniil Medvedev | 6 | St. Petersburg Open, Russia | Hard (i) | 2R | 2–6, 7–5, 6–4 | 36 |
| 2021 | |||||||
| 7. | Stefanos Tsitsipas | 3 | Canadian Open, Canada | Hard | SF | 6–7(2–7), 7–6(7–4), 6–4 | 32 |
| 2025 | |||||||
| 8. | Novak Djokovic | 7 | Brisbane International, Australia | Hard | QF | 7–6(8–6), 6–3 | 293 |
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