Hailey Baptiste

On the junior tour, she reached a career-high ranking of No. 38 on 29 January 2018. She ended runner-up at the US Open junior doubles' tournament in 2018.

Baptiste made her WTA Tour main-draw debut at her hometown tournament, the 2019 Washington Open, and defeated major finalist and former top-ten player, Madison Keys.

She made her major debut at the 2020 US Open as a wildcard player.

She made her WTA 1000 debut at the 2021 Miami Open, after reaching the main draw having received a wildcard for the qualifying competition.

On her debut at the French Open, she qualified for the main draw and recorded her first win at a major over Anna Blinkova.

She received a wildcard for the main draw at the 2023 Miami Open.

At the WTA 1000 2023 Guadalajara Open, she defeated wildcard player Lya Isabel Fernández Olivares and 16th seed Karolína Plíšková for the second time in the season having prevailed also earlier at the Washington Open, to reach the third round of a WTA 1000 for the first time.

Following her first round main-draw win as a qualifier at the 2024 Indian Wells Open over fellow American qualifier Robin Montgomery, she reached the top 100 in the rankings on 18 March 2024. She received a wildcard for the main draw at the Miami Open.

At the French Open, she entered the main draw as a lucky loser and defeated Kayla Day for her second win at this major.

At the WTA 500 Korea Open, she defeated compatriot Sloane Stephens in straight sets. At the WTA 1000 China Open where she qualified for the main draw, she also recorded a first round victory over Varvara Gracheva. With her second round win over seventh seed Barbora Krejčíková at the Wuhan Open as a qualifier, Baptiste became the first player ranked outside the top 100 (at No. 102) to defeat a top-10 since the inception of the tournament. Krejčíková led 5-3, 40-0 in the second set before Baptiste won in straight sets, recording her first top 10 win and reaching her second third round at a 1000-level in her career.

Baptiste made her debut for the United States Billie Jean King Cup team in the 2025 qualifying round held in Bratislava, defeating Rebecca Munk Mortensen and Renáta Jamrichová in wins over Denmark and Slovakia respectively as her country topped the group to make it through to the finals.

At the 2025 French Open, she reached the fourth round of a Grand Slam for the first time in her career with wins over 23rd seed Beatriz Haddad Maia, Nao Hibino, and Jéssica Bouzas Maneiro. Despite losing to compatriot and reigning Australian Open champion Madison Keys in straight sets, Baptiste climbed to a new career-high ranking of world No. 58.

Baptiste made her main-draw debut at Wimbledon where she reached the third round, before falling to the sixth seed Mirra Andreeva, in straight sets. As a result, her ranking climbed inside the top 50 for the first time to No. 48.