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Raven Klaasen ( ; born 16 October 1982) is a South African professional tennis player who specialises in doubles.
He achieved his career-high doubles ranking of world No. 7 in August 2019, and has won 19 doubles titles on the ATP Tour, including two at Masters 1000 level. Klaasen is a two-time Grand Slam finalist, having finished runner-up at the 2014 Australian Open alongside Eric Butorac, and the 2018 Wimbledon Championships with Michael Venus. He was also runner up at the ATP Finals in both 2016 and 2019, partnering Rajeev Ram and Venus respectively.
In singles, Klaasen has a career-high ranking of world No. 208, achieved in October 2011.
He has represented South Africa in the Davis Cup since 2009, and has a win–loss record of 13–4.
He reached his 300th match win at the 2022 Estoril Open with Ben McLachlan defeating Hugo Nys/Jan Zieliński in the round of 16.
| Loss | 2014 | Australian Open | Hard | Eric Butorac | Łukasz Kubot Robert Lindstedt | 3–6, 3–6 |
| Loss | 2018 | Wimbledon | Grass | Michael Venus | Mike Bryan Jack Sock | 3–6, 7–6(9–7), 3–6, 7–5, 5–7 |
| Loss | 2016 | ATP Finals, London | Hard (i) | Rajeev Ram | Henri Kontinen John Peers | 6 –2, 1–6, 8–10 |
| Loss | 2019 | ATP Finals, London | Hard (i) | Michael Venus | Pierre-Hugues Herbert Nicolas Mahut | 3–6, 4–6 |
| 6–3, 6–3 |
| 7–5, 1–6, 7–10 |
| 6–7(1–7), 6–4, 10–8 |
| 2–6, 7–6(9–7), 6–10 |
| 1–6, 3–6 |
| {class="wikitable" !Legend |
| Grand Slam tournaments (0–2) |
| ATP World Tour Finals (0–2) |
| ATP World Tour Masters 1000 (2–3) |
| ATP World Tour 500 Series (6–3) |
| ATP World Tour 250 Series (11–13) |
| Hard (15–15) |
| Clay (1–3) |
| Grass (3–5) |
| Outdoor (13–17) |
| Indoor (6–6) |
| Loss | 0–1 | Open Sud de France, France | 250 Series | Hard (i) | Johan Brunström | Marc Gicquel Michaël Llodra | 3–6, 6–3, 9–11 | |
| Win | 1–1 | Open de Nice, France | 250 Series | Clay | Johan Brunström | Juan Sebastián Cabal Robert Farah | 6–3, 6–2 | |
| Win | 2–1 | Moselle Open, France | 250 Series | Hard (i) | Johan Brunström | Nicolas Mahut Jo-Wilfried Tsonga | 6–4, 7–6(7–5) | |
| Win | 3–1 | Malaysian Open, Malaysia | 250 Series | Hard (i) | Eric Butorac | Pablo Cuevas Horacio Zeballos | 6–2, 6–4 | |
| Loss | 3–2 | Australian Open, Australia | Grand Slam | Hard | Eric Butorac | Łukasz Kubot Robert Lindstedt | 3–6, 3–6 | |
| Win | 4–2 | U.S. National Indoor Championships, United States | 250 Series | Hard (i) | Eric Butorac | Bob Bryan Mike Bryan | 6–4, 6–4 | |
| Win | 5–2 | Stockholm Open, Sweden | 250 Series | Hard (i) | Eric Butorac | Treat Huey Jack Sock | 6–4, 6–3 | |
| Loss | 5–3 | Maharashtra Open, India | 250 Series | Hard | Leander Paes | Lu Yen-hsun Jonathan Marray | 6–3, 7–6(7–4) | |
| Win | 6–3 | Auckland Open, New Zealand | 250 Series | Hard | Leander Paes | Dominic Inglot Florin Mergea | 7–6(7–1), 6–4 | |
| Loss | 6–4 | Delray Beach Open, United States | 250 Series | Hard | Leander Paes | Bob Bryan Mike Bryan | 3–6, 6–3, 6–10 | |
| Loss | 6–5 | Geneva Open, Switzerland | 250 Series | Clay | Lu Yen-hsun | Juan Sebastián Cabal Robert Farah | 5–7, 6–4, 7–10 | |
| Win | 7–5 | Halle Open, Germany | 500 Series | Grass | Rajeev Ram | Rohan Bopanna Florin Mergea | 7–6(7–5), 6–2 | |
| Loss | 7–6 | Malaysian Open, Malaysia | 250 Series | Hard (i) | Rajeev Ram | Treat Huey Henri Kontinen | 6–7(4–7), 2–6 | |
| Win | 8–6 | Japan Open, Japan | 500 Series | Hard | Marcelo Melo | Juan Sebastián Cabal Robert Farah | 7–6(7–5), 3–6, 10–7 | |
| Win | 9–6 | Shanghai Masters, China | Masters 1000 | Hard | Marcelo Melo | Simone Bolelli Fabio Fognini | 6–3, 6–3 | |
| Loss | 9–7 | Miami Open, United States | Masters 1000 | Hard | Rajeev Ram | Pierre-Hugues Herbert Nicolas Mahut | 7–5, 1–6, 7–10 | |
| Loss | 9–8 | Geneva Open, Switzerland | 250 Series | Clay | Rajeev Ram | Steve Johnson Sam Querrey | 4–6, 1–6 | |
| Loss | 9–9 | Rosmalen Grass Court Championships, Netherlands | 250 Series | Grass | Dominic Inglot | Mate Pavić Michael Venus | 3–6, 6–3, 11–9 | |
| Win | 10–9 | Halle Open, Germany (2) | 500 Series | Grass | Rajeev Ram | Łukasz Kubot Alexander Peya | 7–6(7–5), 6–2 | |
| Win | 11–9 | Chengdu Open, China | 250 Series | Hard | Rajeev Ram | Pablo Carreño Busta Mariusz Fyrstenberg | 7−6(7–2), 7−5 | |
| Loss | 11–10 | Japan Open, Japan | 500 Series | Hard | Rajeev Ram | Marcel Granollers Marcin Matkowski | 2–6, 6–7(4–7) | |
| Loss | 11–11 | ATP Finals, United Kingdom | Tour Finals | Hard (i) | Rajeev Ram | Henri Kontinen John Peers | 6–2, 1–6, 8–10 | |
| Win | 12–11 | Delray Beach Open, United States | 250 Series | Hard | Rajeev Ram | Treat Huey Max Mirnyi | 7–5, 7–5 | |
| Win | 13–11 | Indian Wells Masters, United States | Masters 1000 | Hard | Rajeev Ram | Łukasz Kubot Marcelo Melo | 6–7(1–7), 6–4, 10–8 | |
| Loss | 13–12 | Rosmalen Grass Court Championships, Netherlands | 250 Series | Grass | Rajeev Ram | Łukasz Kubot Marcelo Melo | 3–6, 4–6 | |
| Won | 14–12 | Open 13, France | 250 Series | Hard (i) | Michael Venus | Marcus Daniell Dominic Inglot | 6–7(2–7), 6–3, 10–4 | |
| Loss | 14–13 | Rosmalen Grass Court Championships, Netherlands | 250 Series | Grass | Michael Venus | Dominic Inglot Franko Škugor | 6–7(3–7), 5–7 | |
| Loss | 14–14 | Wimbledon Championships, United Kingdom | Grand Slam | Grass | Michael Venus | Mike Bryan Jack Sock | 3–6, 7–6(9–7), 3–6, 7–5, 5–7 | |
| Loss | 14–15 | Canadian Open, Canada | Masters 1000 | Hard | Michael Venus | Henri Kontinen John Peers | 2–6, 7–6(9–7), 6–10 | |
| Loss | 14–16 | Japan Open, Japan | 500 Series | Hard (i) | Michael Venus | Ben McLachlan Jan-Lennard Struff | 4–6, 5–7 | |
| Loss | 14–17 | Auckland Open, New Zealand | 250 Series | Hard | Michael Venus | Ben McLachlan Jan-Lennard Struff | 3–6, 4–6 | |
| Loss | 14–18 | Italian Open, Italy | Masters 1000 | Clay | Michael Venus | Juan Sebastián Cabal Robert Farah | 1–6, 3–6 | |
| Win | 15–18 | Halle Open, Germany (3) | 500 Series | Grass | Michael Venus | Łukasz Kubot Marcelo Melo | 4–6, 6–3, 10–4 | |
| Win | 16–18 | Washington Open, United States | 500 Series | Hard | Michael Venus | Jean-Julien Rojer Horia Tecău | 3–6, 6–3, 10–2 | |
| Loss | 16–19 | ATP Finals, United Kingdom | Tour Finals | Hard (i) | Michael Venus | Pierre-Hugues Herbert Nicolas Mahut | 3–6, 4–6 | |
| Loss | 16–20 | Dubai Tennis Championships, United Arab Emirates | 500 Series | Hard | Oliver Marach | John Peers Michael Venus | 3–6, 2–6 | |
| Win | 17–20 | Cologne Championship, Germany | 250 Series | Hard (i) | Ben McLachlan | Kevin Krawietz Andreas Mies | 6–2, 6–4 | |
| Win | 18–20 | Washington Open, United States (2) | 500 Series | Hard | Ben McLachlan | Neal Skupski Michael Venus | 7–6(7–4), 6–4 | |
| Loss | 18–21 | Open 13, France | 250 Series | Hard (i) | Ben McLachlan | Denys Molchanov Andrey Rublev | 6–4, 5–7, 7–10 | |
| Loss | 18–22 | Hall of Fame Open, United States | 250 Series | Grass | Marcelo Melo | William Blumberg Steve Johnson | 4–6, 5–7 | |
| Loss | 18–23 | Los Cabos Open, Mexico | 250 Series | Hard | Marcelo Melo | William Blumberg Miomir Kecmanović | 0–6, 1–6 | |
| Win | 19–23 | Oct 2022 | Korea Open, South Korea | 250 Series | Hard | Nathaniel Lammons | Nicolás Barrientos Miguel Ángel Reyes-Varela | 6–1, 7–5 |
| Grand Slam tournaments | |||||||||||||||||
| Australian Open | A | A | A | A | A | F | 2R | QF | 2R | 1R | QF | 2R | A | 3R | 3R | 0 / 9 | 18–9 |
| French Open | A | A | A | 1R | 1R | 2R | 1R | 2R | 2R | 3R | 1R | 1R | 2R | 2R | 1R | 0 / 12 | 7–12 |
| Wimbledon | A | A | A | Q1 | 1R | 3R | 2R | SF | 3R | F | SF | NH | QF | 2R | A | 0 / 9 | 22–9 |
| US Open | A | A | A | 3R | 1R | QF | 3R | 2R | 1R | 2R | 2R | 1R | 2R | 2R | A | 0 / 11 | 12–11 |
| Win–loss | 0–0 | 0–0 | 0–0 | 2–2 | 0–3 | 11–4 | 4–4 | 9–4 | 4–4 | 8–4 | 8–4 | 1–3 | 5–3 | 5–4 | 2–2 | 0 / 41 | 59–41 |
| Year-end championship | |||||||||||||||||
| ATP Finals | Did not qualify | F | RR | RR | F | Did not qualify | 0 / 4 | 7–7 | |||||||||
| ATP World Tour Masters 1000 | |||||||||||||||||
| Indian Wells Masters | A | A | A | A | A | 1R | 2R | 1R | W | 2R | QF | NH | 1R | 1R | A | 1 / 8 | 9–7 |
| Miami Open | A | A | A | A | A | 2R | 1R | F | 1R | QF | 1R | NH | 1R | 1R | A | 0 / 8 | 7–8 |
| Monte-Carlo Masters | A | A | A | A | A | 1R | 2R | 1R | 2R | QF | 1R | NH | QF | A | A | 0 / 7 | 4–7 |
| Madrid Open | A | A | A | A | A | 1R | A | 2R | 2R | QF | 2R | NH | 2R | 1R | A | 0 / 6 | 5–6 |
| Italian Open | A | A | A | A | A | A | A | 1R | QF | 2R | F | 1R | 2R | 2R | A | 0 / 7 | 8–7 |
| Canadian Open | A | A | A | A | A | 1R | 1R | QF | SF | F | A | NH | 1R | A | A | 0 / 6 | 6–6 |
| Cincinnati Masters | A | A | A | A | A | 2R | 2R | QF | 2R | 2R | QF | 2R | 1R | A | A | 0 / 8 | 6–8 |
| Shanghai Masters | A | A | A | A | A | 2R | W | 2R | QF | QF | QF | Not Held | A | 1 / 6 | 9–5 | ||
| Paris Masters | A | A | A | A | 2R | QF | QF | 2R | 2R | QF | 1R | 1R | 1R | A | A | 0 / 9 | 6–9 |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 1–1 | 5–8 | 9–6 | 6–9 | 8–8 | 14–9 | 11–8 | 1–3 | 4–8 | 1–4 | 0–0 | 2 / 66 | 60–64 |
| National representation | |||||||||||||||||
| Davis Cup | Z1 | Z1 | PO | PO | Z1 | Z2 | Z2 | Z2 | Z2 | Z1 | Z2 | Z1 | WG2 | WG2 | WG2 | 0 / 0 | 13–7 |
| Career statistics | |||||||||||||||||
| Titles | 0 | 0 | 0 | 0 | 3 | 2 | 4 | 2 | 2 | 1 | 2 | 1 | 1 | 1 | 0 | 19 | |
| Finals | 0 | 0 | 0 | 0 | 4 | 3 | 8 | 7 | 3 | 5 | 5 | 2 | 1 | 4 | 0 | 42 | |
| Overall win–loss | 0–1 | 1–1 | 0–1 | 9–8 | 26–16 | 35–25 | 42–23 | 38–23 | 30–21 | 40–26 | 39–22 | 15–14 | 19–23 | 24–23 | 3–3 | 321–230 | |
| Year-end ranking | 363 | 187 | 112 | 73 | 44 | 20 | 20 | 12 | 25 | 15 | 8 | 18 | 26 | 55 | 337 | 58% | |
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