Katie Volynets (born December 31, 2001) is an American professional tennis player. She has a career-high singles ranking of world No. 56 by the WTA, achieved on July 29, 2024.
Volynets was born in Walnut Creek, California. Her parents had emigrated from Ukraine, and she still has extended family in Kyiv and Dnipro.
2019: Grand Slam tournament debut
On August 11, 2019, Volynets won the USTA Girls 18s National Championships final over Emma Navarro, earning her a wildcard entry into the singles main draw of the US Open. She lost in the first round to eventual champion Bianca Andreescu.
2021: Indian Wells and Wimbledon debuts
In May, she won her first singles title on the ITF Circuit, at the $100k event in Bonita Springs.
She qualified for the Wimbledon Championships, losing to Irina-Camelia Begu in the first round.
Volynets received a wildcard into the singles main draw of the US Open, but was eliminated in the first round by Ajla Tomljanović.
In October, she made her debut at the WTA 1000 level in Indian Wells, also receiving a wildcard, but once more losing in the first round, this time to Petra Martić.
2022: Top 150 debut, first major win
Volynets played in Indian Wells again as a wildcard where she recorded her first win at the WTA 1000-level against Arantxa Rus, before losing to 23rd seed Daria Kasatkina in the second round.
She won the USTA Wildcard Challenge for the French Open where she recorded her first Grand Slam tournament match win over Viktorija Golubic. At the Nottingham Open, she lost to Heather Watson in the first round.
2023: Major third round, first WTA Tour semifinal, top 100
In January, she qualified for the main draw of Auckland Open, where she lost in the first round to Venus Williams, in straight sets.
She reached the Australian Open third round defeating two Russian players, Evgeniya Rodina and world No. 9, Veronika Kudermetova, for her first top-10 win, and becoming the first American qualifier to reach the women's singles third round at the Australian Open since Jennifer Brady in 2017. As a result, she reached a career-high ranking of No. 96 on January 30, 2023.
At the ATX Open, she rallied from 5–0 down and a match point in the third set to win her match against third seed Anastasia Potapova and reach her first WTA Tour quarterfinal. Next, she defeated wildcard Peyton Stearns to reach her first semifinal. As a result, her ranking rose to world No. 74, on 6 March 2023.
She qualified for the US Open but lost in the first round to Wang Xinyu.
2024: Two WTA 1000 third rounds, WTA 125 title, top 60