Hailey Baptiste (born November 3, 2001) is an American professional tennis player. On 18 March 2024, she reached her best singles ranking of world No. 96. She has won one doubles title on the WTA Tour with one doubles title on the WTA Challenger Tour. She has also won four singles and four doubles titles on the ITF Women's Circuit.
On the junior tour, she reached a career-high ranking of No. 38 on January 29, 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, beating Grand Slam finalist and former top-ten player, Madison Keys in the first round.
She made her Grand Slam debut at the 2020 US Open as a wildcard.
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 2021 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 Guadalajara Open, she defeated wildcard 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 2024 French Open, she entered the main draw as a lucky loser and defeated Kayla Day for her second win at this Major.