Zizou Bergs (born 3 June 1999) is a Belgian professional tennis player. He has a career high ATP singles ranking of World No. 186 achieved on 20 September 2021. He also has a career high ATP doubles ranking of World No. 449 achieved on 25 October 2021. Bergs made his ATP main draw debut at the 2020 European Open after receiving a wildcard for the singles main draw. In the first round, he recorded his first ATP victory by defeating Albert Ramos Viñolas in straight sets, before pushing world No. 17 Karen Khachanov to three sets.
He made his ATP main draw debut at the 2020 Erste Bank Open in the singles draw as lucky loser, losing to Dominic Thiem, 4–6, 5–7. In March, ranked No. 389 in the world, he made it to the final of the Challenger Tour event in Lugano, Switzerland, where he lost to Dominic Stephan Stricker. In July, he made another Challenger final in Perugia, Italy losing to Tomas Martin Etcheverry in singles. At the same tournament, he took his revenge, winning his third Challenger doubles title for 2021 by defeating the Argentinian pair Tomas Etcheverry/Renzo Olivo, partnering Dominic Stricker. As a result, he reached a career-high ranking of No. 269 in singles and No. 220 in doubles on 12 July 2021.