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Zizou Bergs (; born 3 June 1999) is a Belgian professional tennis player. He has a career-high ATP singles ranking of world No. 39, achieved on 13 October 2025 and a doubles ranking of No. 265, achieved on 27 November 2023. He is currently the No. 1 player from Belgium.
After defeating fellow qualifier Oscar Otte in the first round of the Swiss Open Gstaad, he reached the top 200 at World No. 196 on 26 July 2021. In October, he again received a wildcard into the European Open, but lost in the first round to Lloyd Harris.
Ranked No. 207, he won the Ilkley Trophy as a qualifier, defeating lucky loser Alexei Popyrin in the semifinals and Jack Sock in the final. As a result, he received a wildcard into Wimbledon, where he made his Grand Slam debut. He also climbed more than 60 positions up the rankings to a new career-high of world No. 146 on 20 June 2022.
He received a wildcard for the Miami Open, but lost in the first round to lucky loser Thanasi Kokkinakis. He entered the U.S. Men's Clay Court Championships as a lucky loser directly into the second round, but lost to Cristian Garín. As the defending champion, he entered the Ilkley Trophy Challenger, but lost to Denis Kudla in the second round.
Bergs missed several months playing on the ATP Tour, due to a torn ligament in his left wrist, but returned in September at the Chengdu Open as a wildcard. In October, he received a wildcard in doubles for the European Open in Antwerp, alongside compatriot Tibo Colson. In November, at the Calgary Challenger, he reached the quarterfinals and won his sixth Challenger title in Drummondville, and in December, his seventh in Yokkaichi.
He received a wildcard for the main draw at the Madrid Open, where he made his debut but lost in the first round to Luca Van Assche. In May, Bergs qualified for the main draw of the Italian Open, where he lost to Rafael Nadal in the first round. Ranked No. 102, Bergs made his French Open debut after qualifying for the main draw. He upset 24th seed Alejandro Tabilo for his first win at a Major and defeated Maximilian Marterer to reach the third round of a Major for the first time where he lost to 10th seed Grigor Dimitrov. As a result, he reached the top 85 in the rankings on 10 June 2024.
In the beginning of the grass court season he entered the main draw of the Rosmalen Open as a lucky loser and defeated local wildcard Tim van Rijthoven, before losing to top seed Alex de Minaur in the second round. He also entered the main draw at the Wimbledon after qualifying but lost to Arthur Cazaux in five sets with a super tiebreaker in the fifth. As a result, he reached the top 75 in the singles rankings on 15 July 2024.
At the US Open, Bergs also played a first round match with a super tiebreaker in the fifth, but won it this time defeating Pavel Kotov. He lost his next match against 31st seed Flavio Cobolli. In October, Bergs reached the quarterfinals at the European Open in Antwerp with wins over Facundo Díaz Acosta and fourth seed Sebastián Báez, before his run was ended by eighth seed Marcos Giron. The following month, ranked No. 61, Bergs also made it through to the quarterfinals at the Moselle Open, defeating lucky loser Manuel Guinard and Hugo Gaston. Bergs lost in the last eight to Cameron Norrie.
In February, Bergs reached his second career semifinal at the 2025 Open 13 Provence in Marseille, with wins over eight seed Nuno Borges and Zhizhen Zhang by retirement.
In March, at the 2025 Miami Open, Bergs reached the third round recording his first top 10 win over eight seed Andrey Rublev. As a result, he reached the top 50 on 31 March 2025. In June, Bergs reached his second career ATP final at the 2025 Libéma Open in 's-Hertogenbosch with a win over fourth seed Alexei Popyrin in the second round, Mark Lajal in the quarterfinals, and Reilly Opelka in the semifinal. He lost to Gabriel Diallo in the final.
In September, Bergs reached the third round of the US Open after the withdrawal of Jack Draper, where he lost to Jaume Munar. in three sets
| Grand Slam tournaments | |||||||||||||
| Australian Open | A | Q1 | 1R | 1R | 1R | 0 / 3 | 0–3 | ||||||
| French Open | A | Q1 | Q2 | 3R | 1R | 0 / 2 | 2–2 | ||||||
| Wimbledon | A | 1R | Q2 | 1R | 1R | 0 / 3 | 0–3 | ||||||
| US Open | Q2 | Q3 | Q1 | 2R | 3R | 0 / 2 | 2–2 | ||||||
| Win–loss | 0–0 | 0–1 | 0–1 | 3–4 | 1–4 | 0 / 10 | 4–10 | ||||||
| ATP Tour Masters 1000 | |||||||||||||
| Indian Wells Masters | A | A | A | A | 2R | 0 / 1 | 1–1 | ||||||
| Miami Open | A | A | 1R | Q2 | 3R | 0 / 2 | 2–2 | ||||||
| Monte-Carlo Masters | A | A | A | A | Q1 | 0 / 0 | 0–0 | ||||||
| Madrid Open | A | A | A | 1R | 1R | 0 / 2 | 0–2 | ||||||
| Italian Open | A | A | A | 1R | A | 0 / 1 | 0–1 | ||||||
| Canadian Open | A | A | A | A | 1R | 0 / 1 | 0–1 | ||||||
| Cincinnati Open | A | A | A | Q1 | R2 | 0 / 1 | 1–1 | ||||||
| Shanghai Masters | NH | A | 2R | QF | 0 / 2 | 5–2 | |||||||
| Paris Masters | A | A | A | 2R | 0 / 1 | 1–1 | |||||||
| Win–loss | 0–0 | 0–0 | 0–1 | 2–4 | 8–6 | 0 / 11 | 10–11 | ||||||
| {class="wikitable" style=font-size:90% !Legend |
| Grand Slam (0–0) |
| ATP Masters 1000 (0–0) |
| ATP 500 (0–0) |
| ATP 250 (0–2) |
| Hard (0–1) |
| Clay (0–0) |
| Grass (0–1) |
| Outdoor (0–2) |
| Indoor (0–0) |
| Loss | 0–1 | Auckland Open, New Zealand | ATP 250 | Hard | Gaël Monfils | 3–6, 4–6 | |
| Loss | 0–2 | Libéma Open, Netherlands | ATP 250 | Grass | Gabriel Diallo | 5–7, 6–7(8–10) |
| {class="wikitable" style=font-size:97% !Legend |
| ATP Challenger Tour (8–4) |
| Hard (4–2) |
| Clay (3–2) |
| Grass (1–0) |
| Win | 1–0 | St. Petersburg, Russia | Challenger | Hard (i) | Altuğ Çelikbilek | 6–4, 3–6, 6–4 | |
| Win | 2–0 | Lille, France | Challenger | Hard (i) | Grégoire Barrère | 4–6, 6–1, 7–6(7–5) | |
| Win | 3–0 | Almaty, Kazakhstan | Challenger | Clay | Timofey Skatov | 4–6, 6–3, 6–2 | |
| Loss | 3–1 | Saint-Brieuc, France | Challenger | Hard (i) | Jack Draper | 2–6, 7–5, 4–6 | |
| Loss | 3–2 | Troisdorf, Germany | Challenger | Clay | Lukáš Klein | 2–6, 4–6 | |
| Win | 4–2 | Ilkley, United Kingdom | Challenger | Grass | Jack Sock | 7–6(9–7), 2–6, 7–6(8–6) | |
| Loss | 4–3 | Manacor, Spain | Challenger | Hard | Luca Nardi | 6–7(2–7), 6–3, 5–7 | |
| Win | 5–3 | Tallahassee, USA | Challenger | Clay (green) | Wu Tung-lin | 7–5, 6–2 | |
| Win | 6–3 | Drummondville, Canada | Challenger | Hard (i) | James Duckworth | 6–4, 7–5 | |
| Win | 7–3 | Yokkaichi, Japan | Challenger | Hard | Michael Mmoh | 6–2, 7–6(7–2) | |
| Loss | 7–4 | Sarasota, USA | Challenger | Clay (green) | Thanasi Kokkinakis | 3–6, 6–1, 0–6 | |
| Win | 8–4 | Tallahassee, USA (2) | Challenger | Clay (green) | Mitchell Krueger | 6–4, 7–6(11–9) |
| {class="wikitable" style=font-size:97% !Legend |
| ATP Challenger Tour (1–0) |
| Win | 1–0 | Lugano, Switzerland | Challenger | Hard (i) | David Pel | Constantin Frantzen Hendrik Jebens | 6–2, 7–6(8–6) |
| {class="wikitable" style=font-size:97% !Legend |
| ITF Futures/WTT (4–4) |
| Hard (3–2) |
| Clay (1–2) |
| Win | 1–0 | Turkey F2, Antalya | Futures | Hard | Dimitar Kuzmanov | 6–3, 6–4 | |
| Win | 2–0 | Poland F1, Wisła | Futures | Clay | Michael Vrbenský | 3–6, 6–1, 6–2 | |
| Loss | 2–1 | Belgium F2, Arlon | Futures | Clay | Juan Pablo Varillas | 6–7(6–8), 6–4, 1–6 | |
| Loss | 2–2 | Belgium F5, Duinbergen | Futures | Clay | Jeroen Vanneste | 6–7(2–7), 3–6 | |
| Win | 3–2 | M15 Doha, Qatar | WTT | Hard | Adrian Obert | 6–4, 6–1 | |
| Loss | 3–3 | M15 Monastir, Tunisia | WTT | Hard | Nuno Borges | 4–6, 6–7(6–8) | |
| Loss | 3–4 | M15 Heraklion, Greece | WTT | Hard | Clement Geens | 6–3, 4–6, 1–6 | |
| Win | 4–4 | M15 Bratislava, Slovakia | WTT | Hard (i) | Bogdan Bobrov | 6–4, 6–2 |
| {class="wikitable" style=font-size:97% !Legend |
| ITF Futures/WTT (4–4) |
| Hard (3–2) |
| Clay (1–2) |
| Loss | 0–1 | Qatar F1, Doha | Futures | Hard | Scott Griekspoor | Jonas Merckx Fred Simonsson | 7–6(7–3), 3–6, 4–10 | |
| Win | 1–1 | Qatar F2, Doha | Futures | Hard | Fred Simonsson | Matěj Vocel Marek Gengel | 6–4, 3–6, 10–6 | |
| Loss | 1–2 | Italy F12, Reggio Emilia | Futures | Clay | Maxime Tabatruong | Tuna Altuna Alexandar Lazov | 4–6, 2–6 | |
| Win | 2–2 | M15 Doha, Qatar | WTT | Hard | Geoffrey Blancaneaux | Arnaud Bovy Jesper de Jong | 6–2, 6–4 | |
| Win | 3–2 | M15 Koksijde, Belgium | WTT | Clay | Dan Added | Romain Barbosa Arnaud Bovy | 6–4, 3–6, 10–3 | |
| Loss | 3–3 | M15 Benicarló, Spain | WTT | Clay | Tiago Cação | Benjamín Winter López Pablo Llamas Ruiz | 3–6, 4–6 | |
| Win | 4–3 | M15 Monastir, Tunisia | WTT | Clay | Francesco Vilardo | Aziz Dougaz Benjamin Lock | 6–3, 6–4 | |
| Loss | 4–4 | M15 Doha, Qatar | WTT | Hard | Zura Tkemaladze | Simon Freund Jonathan Mridha | 1–6, 0–6 |
| 1 |
| 2025 | ||||||||
| 1. | Andrey Rublev | 9 | Miami Open, United States | Hard | 2R | 7–5, 6–4 | 51 | |
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