Carsten Thomas Ball (born 20 June 1987) is an American-Australian retired professional tennis player. Although born and based in the United States, Carsten has represented Australia on tour.
Ball has five Futures titles to his credit. His best singles results previously consisted of three runner up appearances in American Challengers in 2008 and 2009. In August 2009, Ball reached the final of the LA Tennis Open. He lost to sixth-seeded Sam Querrey. Later in August he qualified for the US Open, where he reached the second round, losing to Novak Djokovic in straight sets.
Ball enjoyed considerable success as a doubles player, often partnering with fellow Australian Chris Guccione. Ball and Guccione won back-to-back doubles titles in the 2011 Sacramento Challenger and Tiburon ATP Challenger Tour events, both $100,000 tournaments. He is now serving as the coach of American tennis player Tennys Sandgren.
| Grand Slam Tournaments (0–0) |
| ATP World Tour Finals (0–0) |
| ATP World Tour Masters 1000 (0–0) |
| ATP World Tour 500 Series (0–0) |
| ATP World Tour 250 Series (0–1) |
| Loss | 0–1 | Aug 2009 | Los Angeles, US | Hard | Sam Querrey | 4–6, 6–3, 1–6 |
| Grand Slam Tournaments (0–0) |
| ATP World Tour Finals (0–0) |
| ATP World Tour Masters 1000 (0–0) |
| ATP World Tour 500 Series (0–0) |
| ATP World Tour 250 Series (0–1) |
| Win | 1–0 | Jul 2010 | Newport, Rhode Island, U.S. | Grass | Chris Guccione | Santiago González Travis Rettenmaier | 6–3, 6–4 |
| Grand Slam tournaments | |||||||||||||||||
| Australian Open | Q2 | 1R | 1R | 1R | Q3 | 0–3 | |||||||||||
| French Open | A | A | 2R | Q1 | A | 1–1 | |||||||||||
| Wimbledon | A | A | 1R | Q1 | A | 0–1 | |||||||||||
| US Open | 1R | 2R | 2R | Q2 | A | 2–3 | |||||||||||
| Grand Slam tournaments | |||||||||||||||||
| Australian Open | 2R | 2R | 3R | 3R | 2R | 3R | 2R | 10–7 | |||||||||
| French Open | A | A | A | A | 1R | A | 1R | 0–2 | |||||||||
| Wimbledon | A | A | A | A | 3R | 3R | A | 4–2 | |||||||||
| US Open | A | A | A | QF | 1R | A | A | 3–2 | |||||||||
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