Kevin Michael Anderson (born 18 May 1986) is a South African former professional tennis player. He achieved his career-high Association of Tennis Professionals (ATP) ranking of world No. 5 on 16 July 2018. He was the first South African to be ranked in the top 5 since Kevin Curren was No. 5 on 23 September 1985.

In February 2011, Anderson won his first ATP Tour title at the South African Open in his hometown of Johannesburg. Anderson reached his first major final at the 2017 US Open, where he lost to Rafael Nadal. In the 2018 Wimbledon semifinals, Anderson reached his second major final by defeating American John Isner in the second-longest match in the history of major tournaments, at 6 hours and 36 minutes (second only to the 2010 match between John Isner and Nicolas Mahut). He then lost to Novak Djokovic in the final. On 3 May 2022, Anderson retired at age 35, but he announced his comeback in July 2023.

Anderson started playing tennis at age six and was competitive in 800-metre races at school. On the eve of their meeting in the finals at the 2017 US Open, it emerged that as a 12-year old, Anderson regularly competed against future world number one Rafael Nadal on the juniors circuit.

Anderson played three seasons of college tennis in the United States at the University of Illinois Urbana-Champaign. He was a three-time All-American in singles and two-time All-American in doubles. During his sophomore year (2005–06), he won the national doubles championships with playing partner Ryan Rowe.

In 2007, Anderson led Illinois to a runner-up team finish, losing to host Georgia on their home courts. In the championship dual match, Anderson lost at #1 singles to future ATP top-ten player, John Isner. During the singles tournament, Anderson lost in the semifinals to eventual two-time national champion, Somdev Devvarman of Virginia. In doubles, Anderson and partner, Ryan Rowe, fell short of repeating as champions, losing in the championship match to Marco Born and Andreas Siljeström of Middle Tennessee State in three sets, after having a couple match points.^{[citation needed]}

At age 17, Anderson entered his first professional tournament, winning four main-draw matches in the four-week tournament to earn a world ranking of No. 1178 from his only tournament of the year. He also finished the year with a doubles ranking of No. 902. In November, Anderson entered his third pro tournament and won the Botswana F1 to push his ranking to No. 769. He followed that up the next two weeks in South Africa, reaching the final in F1 and the semifinals in F2 to finish the year ranked No. 665 in singles from just 3 tournaments.

At age 19, Anderson continued to play at the Futures level, exclusively in the United States, reaching the semifinals of USA F21 in August. In November, he played his first Challenger event in Champaign, qualifying and beating No. 192 Jan-Michael Gambill in the first round. He finished the year ranked No. 766.

In 2005, Anderson played his first pro tournaments of the year in June, again in the United States, reaching the finals of USA F13 and F21. He returned to Champaign again in November, beating No. 107 Kevin Kim to reach his first Challenger quarterfinal. He finished the year ranked No. 517. In doubles, he won a pair of USA Futures back to back in June and finished the year ranked No. 530.