Alizé Cornet (French pronunciation: [alize kɔʁnɛ]; born 22 January 1990) is a French former professional tennis player. She has won six singles and three doubles titles on the WTA Tour, as well as three singles and three doubles titles on the ITF Circuit. On 16 February 2009, she reached her highest WTA singles ranking of world No. 11. Cornet has also made the second week at each of the four Grand Slam events, having reached the quarterfinals at the 2022 Australian Open, and the fourth round at the 2014 Wimbledon Championships, the 2015 and 2017 French Opens, and the 2020 US Open. She holds the record for the most consecutive Grand Slam appearances with 69 and also in third place for overall appearances with 72.

Cornet became known for defeating world No. 1 Serena Williams on three occasions in 2014. At the Dubai Tennis Championships she recorded a straight-sets win over Williams in the semifinals, which resulted in Cornet reaching her biggest singles final in almost six years. In July, at the Wimbledon Championships, she came back from a set down to upset Williams in the third round, handing the American her earliest exit at the tournament since 2005. Her third win came in the second round of Wuhan later that year, where Williams retired due to illness.

Cornet is responsible for ending the then No. 1 Iga Swiatek’s 37-match win streak in the third round of the 2022 Wimbledon Championships, the longest in the 21st century and tied for the 12th longest in the Open Era. It was Cornet’s fourth win over a No. 1 ranked player.

Cornet also has an impressive junior record, reaching a career-high combined junior ranking of world No. 8, on 11 June 2007. She won her sole Grand Slam junior singles title at the 2007 French Open.

Cornet made her Grand Slam singles debut at the age of 15 in the 2005 French Open after receiving a singles main-draw wildcard. Coming into that tournament ranked only 645th in the world, she upset 71st-ranked Alina Jidkova in the first round before losing to No. 3 seed Amélie Mauresmo in the second round. At the 2006 French Open, she beat Virginia Ruano Pascual of Spain in the first round before losing to Tathiana Garbin in the second round. She could not repeat this performance at the 2007 French Open, where she lost in the first round to No. 26 seed Venus Williams. Cornet made her Wimbledon singles debut in 2007. At that tournament, she was defeated in the final qualifying round by Olga Govortsova, but made it to the main draw as a lucky loser when Li Na withdrew. Cornet defeated Maria Kirilenko the first round of the main draw before losing to the experienced No. 26 seed Ai Sugiyama in the second round in three sets. In 2007, Cornet won the $50k singles title in Dnipropetrovsk, beating Stefanie Vögele in the final. Cornet made her US Open singles debut in 2007. At that tournament, she defeated after three qualifying matches in the main draw No. 29 seed Samantha Stosur and unseeded Caroline Wozniacki in the first and second rounds, respectively, before losing to No. 3 seed, Jelena Janković.

Cornet reached the second round of the Australian Open where she lost to ninth seed Daniela Hantuchová. Over the following months, Cornet experienced a great level of success on the main tour, particularly on clay, reaching the final in Acapulco and the semifinals in Amelia Island and Charleston (a Tier-I event). Cornet entered the Rome Masters and beat Vera Dushevina in the first round, Francesca Schiavone in the second, world No. 3 Svetlana Kuznetsova in the third, and then received a walkover from an injured Serena Williams to get into the semifinals. She defeated Anna Chakvetadze to reach her first Tier-I final where, however, she lost to Janković in two sets.

Due to her great run at Rome, she rose to No. 20 in the world and was seeded 19th for her home Grand Slam, the French Open. She defeated Julia Vakulenko in the first round after a stylish display. She then beat clay specialist Gisela Dulko in the second round but lost to 14th seed Agnieszka Radwańska in the third round.

She suffered a poor grass-court season, making first round exits at Eastbourne (to Amélie Mauresmo) and at Wimbledon, to Anastasia Pavlyuchenkova.