Κέιτι Βόλινετς

2019: Grand Slam 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 Bianca Andreescu, who went on to win the tournament.

2021: WTA 1000 and Wimbledon debut

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 for the first time at this major.

Volynets received a wildcard into the singles main draw of the US Open.

In October, she made her debut at the WTA 1000 level in Indian Wells, also receiving a wildcard.

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. She won the USTA Wildcard Challenge for the French Open where she recorded her first Grand Slam 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 75

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 30 January 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: WTA 1000 third round

At the 2024 ATX Open, she reached again the second round as a wildcard defeating Renata Zarazúa.

At the WTA 1000 Indian Wells Open, she received a wildcard and defeated Mirra Andreeva and sixth seed Ons Jabeur, both in straight sets to reach the third round for the first time at this level. She lost to wildcard Caroline Wozniacki. Next, she qualified for the 2024 Miami Open, making her debut at this WTA 1000, and recorded a first-round win over another American, former Grand Slam champion Sofia Kenin.

She qualified for the 2024 Credit One Charleston Open and defeated Arantxa Rus in 3 hours 43 minutes with two tiebreaks, saving four match points, in the longest WTA match for the season thus far. She also qualified for the main draw at the Italian Open.