Raven Klaasen
Raven Klaasen is a professional South African tennis player. He attended school at De Kuilen High School. His career-high singles ranking is world No. 208, achieved on 24 October 2011. He has had more success playing doubles, with the notable achievement of reaching the 2014 Australian Open finals with partner Eric Butorac. Their run to the final included a victory over the world No. 1 team of Bob and Mike Bryan.
Klaasen has represented South Africa at the Davis Cup where he has a win/loss record of 13–4.
Significant finals
Grand Slam finals
Doubles: 2 (2 runner-ups)
Year-end championships
Doubles: 2 (2 runner-ups)
Masters 1000 finals
Doubles: 5 (2 titles, 3 runner-ups)
ATP career finals
Doubles: 36 (16 titles, 20 runner-ups)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | 2013 Open Sud de France – Doubles| | Open Sud de France, Lyon | 250 Series | Hard |  Johan Brunström |  Marc Gicquel Michaël Llodra | 3–6, 6–3, |
| Win | 1–1 | 2013 Open de Nice Côte d'Azur – Doubles| | Open de Nice, France | 250 Series | Clay | Johan Brunström |  Juan Sebastián Cabal Robert Farah | 6–3, 6–2 |
| Win | 2–1 | 2013 Moselle Open – Doubles| | Moselle Open, France | 250 Series | Hard | Johan Brunström | Nicolas Mahut Jo-Wilfried Tsonga | 6–4, 7–6 |
| Win | 3–1 | 2013 Proton Malaysian Open – Doubles| | Malaysian Open, Malaysia | 250 Series | Hard |  Eric Butorac |  Pablo Cuevas Horacio Zeballos | 6–2, 6–4 |
| Loss | 3–2 | 2014 Australian Open – Men's Doubles| | Australian Open, Australia | Grand Slam | Hard | Eric Butorac |  Łukasz Kubot Robert Lindstedt | 3–6, 3–6 |
| Win | 4–2 | 2014 U.S. National Indoor Tennis Championships – Doubles| | U.S. National Indoor Championships, United States | 250 Series | Hard | Eric Butorac | Bob Bryan Mike Bryan | 6–4, 6–4 |
| Win | 5–2 | 2014 Stockholm Open – Doubles| | Stockholm Open, Sweden | 250 Series | Hard | Eric Butorac |  Treat Huey Jack Sock | 6–4, 6–3 |
| Loss | 5–3 | 2015 Aircel Chennai Open – Doubles| | Chennai Open, India | 250 Series | Hard |  Leander Paes |  Lu Yen-hsun Jonathan Marray | 6–3, 7–6 |
| Win | 6–3 | 2015 Heineken Open – Doubles| | Auckland Open, New Zealand | 250 Series | Hard | Leander Paes | Dominic Inglot Florin Mergea | 7–6, 6–4 |
| Loss | 6–4 | 2015 Delray Beach International Tennis Championships – Doubles| | Delray Beach Open, United States | 250 Series | Hard | Leander Paes | Bob Bryan Mike Bryan | 3–6, 6–3, |
| Loss | 6–5 | 2015 Geneva Open – Doubles| | Geneva Open, Switzerland | 250 Series | Clay | Lu Yen-hsun | Juan Sebastián Cabal Robert Farah | 5–7, 6–4, |
| Win | 7–5 | 2015 Gerry Weber Open – Doubles| | Halle Open, Germany | 500 Series | Grass | Rajeev Ram | Rohan Bopanna Florin Mergea | 7–6, 6–2 |
| Loss | 7–6 | 2015 Malaysian Open, Kuala Lumpur – Doubles| | Malaysian Open, Malaysia | 250 Series | Hard | Rajeev Ram | Treat Huey Henri Kontinen | 6–7, 2–6 |
| Win | 8–6 | 2015 Rakuten Japan Open Tennis Championships – Doubles| | Japan Open, Japan | 500 Series | Hard |  Marcelo Melo | Juan Sebastián Cabal Robert Farah | 7–6, 3–6, |
| Win | 9–6 | 2015 Shanghai Rolex Masters – Doubles| | Shanghai Masters, China | Masters 1000 | Hard | Marcelo Melo |  Simone Bolelli Fabio Fognini | 6–3, 6–3 |
| Loss | 9–7 | 2016 Miami Open – Men's Doubles| | Miami Open, United States | Masters 1000 | Hard | Rajeev Ram | Pierre-Hugues Herbert Nicolas Mahut | 7–5, 1–6, |
| Loss | 9–8 | 2016 Geneva Open – Doubles| | Geneva Open, Switzerland | 250 Series | Clay | Rajeev Ram | Steve Johnson Sam Querrey | 4–6, 1–6 |
| Loss | 9–9 | 2016 Ricoh Open – Men's Doubles| | Rosmalen Grass Court Championships, Netherlands | 250 Series | Grass | Dominic Inglot |  Mate Pavić Michael Venus | 3–6, 6–3, |
| Win | 10–9 | 2016 Gerry Weber Open – Doubles| | Halle Open, Germany | 500 Series | Grass | Rajeev Ram | Łukasz Kubot Alexander Peya | 7–6, 6–2 |
| Win | 11–9 | 2016 Chengdu Open – Doubles| | Chengdu Open, China | 250 Series | Hard | Rajeev Ram |  Pablo Carreño Busta Mariusz Fyrstenberg | 7−6, 7−5 |
| Loss | 11–10 | 2016 Rakuten Japan Open Tennis Championships – Doubles| | Japan Open, Japan | 500 Series | Hard | Rajeev Ram | Marcel Granollers Marcin Matkowski | 2–6, 6–7 |
| Loss | 11–11 | 2016 ATP World Tour Finals – Doubles| | ATP Finals, United Kingdom | Tour Finals | Hard | Rajeev Ram | Henri Kontinen John Peers | 6–2, 1–6, |
| Win | 12–11 | 2017 Delray Beach International Tennis Championships – Doubles| | Delray Beach Open, United States | 250 Series | Hard | Rajeev Ram | Treat Huey Max Mirnyi | 7–5, 7–5 |
| Win | 13–11 | 2017 BNP Paribas Open – Men's Doubles| | Indian Wells Masters, United States | Masters 1000 | Hard | Rajeev Ram | Łukasz Kubot Marcelo Melo | 6–7, 6–4, |
| Loss | 13–12 | 2017 Ricoh Open – Men's Doubles| | Rosmalen Grass Court Championships, Netherlands | 250 Series | Grass | Rajeev Ram | Łukasz Kubot Marcelo Melo | 3–6, 4–6 |
| Won | 14–12 | 2018 Open 13 – Doubles| | Open 13, France | 250 Series | Hard | Michael Venus | Marcus Daniell Dominic Inglot | 6–7, 6–3, |
| Loss | 14–13 | 2018 Rosmalen Grass Court Championships – Men's Doubles| | Rosmalen Grass Court Championships, Netherlands | 250 Series | Grass | Michael Venus | Dominic Inglot Franko Škugor | 6–7, 5–7 |
| Loss | 14–14 | 2018 Wimbledon Championships – Men's Doubles| | Wimbledon Championships, United Kingdom | Grand Slam | Grass | Michael Venus | Mike Bryan Jack Sock | 3–6, 7–6, 3–6, 7–5, 5–7 |
| Loss | 14–15 | 2018 Rogers Cup – Men's Doubles| | Canadian Open, Canada | Masters 1000 | Hard | Michael Venus | Henri Kontinen John Peers | 2–6, 7–6, |
| Loss | 14–16 | 2018 Rakuten Japan Open Tennis Championships – Doubles| | Japan Open, Japan | 500 Series | Hard | Michael Venus |  Ben McLachlan Jan-Lennard Struff | 4–6, 5–7 |
| Loss | 14–17 | 2019 ASB Classic – Men's Doubles| | Auckland Open, New Zealand | 250 Series | Hard | Michael Venus | Ben McLachlan Jan-Lennard Struff | 3–6, 4–6 |
| Loss | 14–18 | 2019 Italian Open – Men's Doubles| | Italian Open, Italy | Masters 1000 | Clay | Michael Venus | Juan Sebastián Cabal Robert Farah | 1–6, 3–6 |
| Win | 15–18 | 2019 Noventi Open – Doubles| | Halle Open, Germany | 500 Series | Grass | Michael Venus | Łukasz Kubot Marcelo Melo | 4–6, 6–3, |
| Win | 16–18 | 2019 Citi Open – Men's Doubles| | Washington Open, United States | 500 Series | Hard | Michael Venus |  Jean-Julien Rojer Horia Tecău | 3–6, 6–3, |
| Loss | 16–19 | 2019 ATP Finals – Doubles| | ATP Finals, United Kingdom | Tour Finals | Hard | Michael Venus | Pierre-Hugues Herbert Nicolas Mahut | 3–6, 4–6 |
| Loss | 16–20 | 2020 Dubai Tennis Championships – Men's Doubles| | Dubai Tennis Championships, United Arab Emirates | 500 Series | Hard | Oliver Marach | John Peers Michael Venus | 3–6, 2–6 |