Kwon Soon-woo (; born 2 December 1997) is a South Korean professional tennis player. He has been ranked as high as world No. 52 ranking by the Association of Tennis Professionals (ATP), which he first achieved in November 2021. He also has a career-high doubles ranking of world No. 227, attained in October 2022. Since turning professional in 2015, Kwon has won two ATP, three ATP Challenger Tour and five ITF World Tennis Tour singles titles. He broke into the top 100 of the ATP singles rankings in August 2019 after reaching the quarterfinals at the Los Cabos Open and contested his first ATP Tour final at the Astana Open in September 2021, where he won his maiden title and made his top 60 debut. In January 2023, he won his second ATP Tour title at the Adelaide International as a lucky loser, becoming the first Korean to win multiple ATP titles. Early life Kwon was born in a small town Sangju and began playing tennis at age 10. He moved to Seoul at age 16 and attended high school there with Lee Duck-hee, another future ATP Tour player. His father Younghun is a talented amateur tennis player and introduced him to tennis. His favorite surface is hard and favorite shots are down-the-line forehand and drop shot. Professional career 2018–2019: ATP Tour & Grand Slam & top 100 debuts Kwon made his tour-level and Grand Slam debut after winning the 2018 Asia-Pacific Wildcard Playoff for the main draw of the 2018 Australian Open. He made his top 100 debut on 5 August 2019 at world No. 97, after reaching the quarterfinals as a qualifier at the 2019 Los Cabos Open. 2020–2021: First major win at the US Open; French Open third round, maiden ATP title In February 2020, Kwon reached four consecutive ATP Tour-level quarterfinals in Pune, New York, Delray Beach and Acapulco. As a result, Kwon rose to a career-high ranking of 69 on 2 March 2020. Kwon defeated world No. 24, Dušan Lajović, in straight sets to reach the quarterfinals in Acapulco, which was his first ATP 500 event. He lost to eventual champion Rafael Nadal in the quarterfinals. At the 2020 US Open Kwon recorded his first win in a Grand Slam defeating wildcard Thai-Son Kwiatkowski. Kwon reached the third round of a Grand Slam for the first time in his career at the 2021 French Open