|Country (sports)||United States|
|Born||February 13, 1995|
Charlotte, North Carolina
|Height||6 ft 2 in (1.88 m)|
|Plays||Right-handed (two-handed backhand)|
|College||University of Virginia|
|Career record||0-6 (0%) (Grand Slam, ATP Tour level, and Davis Cup)|
|Highest ranking||No. 181 (3 February 2020)|
|Current ranking||No. 556 (20 June 2022)|
|Grand Slam singles results|
|Australian Open||Q1 (2020, 2021)|
|French Open||Q2 (2021)|
|Wimbledon||Q1 (2021, 2022)|
|US Open||1R (2017, 2020)|
|Career record||0-1 (0%)|
|Highest ranking||No. 232 (July 29, 2019)|
|Current ranking||No. 820 (20 June 2022)|
|Grand Slam doubles results|
|US Open||1R (2019)|
|Last updated on: 20 June 2022.|
Thai-Son Kwiatkowski (born February 13, 1995) is a Vietnamese American tennis player. He played collegiately for the Virginia Cavaliers. On May 29, 2017, Kwiatkowski won the NCAA Men's Singles Championship. This victory earned him a wildcard into the main draw of the 2017 US Open.
Coming out of high school, he was the nation's top recruit. Kwiatkowski was on three national championship teams during his time at Virginia. As a sophomore, he tied the school's single season wins record, going 44-8 during the season. On September 11, 2016, Kwiatkowski won the American Collegiate Invitational, which earned him a wild card into the qualifying tournament for the 2017 US Open. After his senior season, he was named first-team all-ACC. Kwiatkowski won the singles title at the 2017 NCAA Men's Singles Championship, defeating William Blumberg in the final.
After winning the NCAA singles championship, Kwiatkowski was awarded a wildcard into the main draw of the 2017 US Open. He faced the 23rd seed Mischa Zverev in the first round, losing in five sets.
Thai-Son's parents are Wendi Le and Tim Kwiatkowski. He has a younger brother named Liem-Son. His parents are both University of Virginia alumni. Kwiatkowski is of Vietnamese and Polish descent. Kwiatkowski majored in commerce.
On 23 February 2021, Thai-Son Kwiatkowski has successfully obtained Vietnamese citizenship and will play for Vietnam's national tennis team in upcoming tournaments. He immediately became the most accomplished tennis player to represent Vietnam after he obtained the citizenship and planned to represent the country in international competition. He is playing for Hung Thinh - Ho Chi Minh City team since October 2019.
Thai-Son is not the first foreign-born tennis player to be recruited by a domestic tennis team. Daniel Nguyen a Vietnamese American tennis player is playing for the Hai Dang - Tay Ninh team and obtained Vietnamese citizenship in 2019.
|Win||1-0||Dec 2016||Puerto Rico F1, Mayagüez||Futures||Hard||Alexios Halebian||6-1, 6-4|
|Win||2-0||Oct 2017||USA F33, Houston||Futures||Hard||Sebastian Korda||6-2, 6-2|
|Win||3-0||May 2018||Singapore F1, Singapore||Futures||Hard||Soichiro Moritani||6-2, 6-2|
|Win||4-0||Jun 2018||Canada F3, Calgary||Futures||Hard||Paul Oosterbaan||6-4, 6-3|
|Win||5-0||Feb 2020||Newport Beach, USA||Challenger||Hard||Daniel Elahi Galán||6-4, 6-1|
|Win||1-0||Jun 2016||USA F17, Charlottesville||Futures||Hard||Mac Styslinger|| Greg Jones
|Win||2-0||Jun 2016||USA F18, Winston-Salem||Futures||Hard||Jared Hiltzik|| Austin Smith
|Loss||2-1||Aug 2016||Finland F1, Kaarina||Futures||Clay||Jose Statham|| Herkko Pöllänen
|7-6(7-4), 3-6, [6-10]|
|Loss||2-2||Dec 2016||Puerto Rico F1, Mayagüez||Futures||Hard||Quinton Vega|| Neboj?a Peri?
|Win||3-2||Mar 2017||France F5, Toulouse||Futures||Hard (i)||Fabien Reboul|| Niels Desein
|Loss||3-3||Jun 2017||USA F20, Rochester||Futures||Clay||Luca Corinteli|| Hugo Di Feo
|Loss||3-4||Oct 2017||USA F33, Houston||Futures||Hard||Austin Krajicek|| Aron Hiltzik
|Loss||3-5||Dec 2017||Mexico F7, Metepec||Futures||Hard||John Paul Fruttero|| Gonzalo Escobar
|Win||4-5||Jul 2018||Canada F4, Kelowna||Futures||Hard||Julian Bradley|| Charlie Emhardt
|Loss||4-6||Apr 2019||Tallahassee, USA||Challenger||Clay||Noah Rubin|| Roberto Maytin
|2-6, 6-4, [7-10]|
|Loss||4-7||Jul 2019||Winnetka, USA||Challenger||Hard||Christopher Eubanks|| JC Aragone
|Win||5-7||Mar 2020||Indian Wells, USA||Challenger||Hard||Denis Kudla|| Sebastian Korda
|6-3, 2-6, [10-6]|