final, where she beat Zhang Shuai in under an hour. Konta had to withdraw from Wimbledon because one of her team tested positive for COVID-19, forcing her to endure a quarantine. At the 2021 National Bank Open in Montreal, Konta defeated Zhang Shuai in the first round, following her retirement in the second set. She then played third seed Elina Svitolina in the second round. Konta claimed her first win against Svitolina after losing their first 5 matches. In the third round, Konta was forced to withdraw against Coco Gauff. Konta next played in the 2021 Western & Southern Open, but lost in the first round to Karolína Muchová in three sets. She withdrew from the US Open, and she did not play another match for the rest of the season. Her ranking had dropped to No. 82 in October 2021, and, after residual points from the 2019 season were dropped, her ranking fell to No. 113 in the world by 29 November 2021, her lowest ranking since August 2015. On 1 December 2021, Konta announced her retirement from professional tennis, after suffering from a long-term right knee injury. Playing style Konta was an aggressive baseliner, with her game centered around her flat, quick, and powerful groundstrokes. Konta was known for creating sharp angles, being able to hit winners from any position on the court. According to WTA match stats in 2016, she was fourth in ace counts, won 62% of her service points, 74.8% of service games and won most of the second serve points at 52.7%. She preferred to attack from the baseline, rather than to come to the net to volley. Konta was often criticized by commentators for a lack of mental toughness and a lack of variety or a "plan B" in tough match situations, but after hiring Dimitri Zavialoff as her coach, she utilised more drop shots and tried to come in more often although she retained an uncomfortable relationship with the net and never looked truly comfortable there. Grass was her favourite surface, but the majority of her success came on hard courts. Endorsements Konta's clothing sponsor was Asics until 2019, when she switched to Ellesse. Her racquet sponsor was Babolat. She endorsed the Babolat Pure Aero range of racquets. In 2017, she became the first UK ambassador of Nature Valley cereal bars as part of their British Tennis partnership. In 2019 British accessories