Osgar O'Hoisin

Osgar O'Hoisin (born 3 September 1996) is an Irish tennis player. He has a career high ATP singles ranking of No. 732 achieved on 22 May 2023, and a career high doubles ranking of No. 587 achieved on 2 February 2024.

He attended the University of Wisconsin–Madison, and played for the Wisconsin Badgers tennis team between 2015 and 2019.

Career
O'Hoisin is a multiple time club champion in his boyhood club Donnybrook Tennis Club, in Dublin, Ireland. He was Irish under-18 champion in 2012 and 2015.

National representation
O'Hoisin has represented Ireland at the Davis Cup since 2018. He has a win–loss record of 2–4 in singles and 3–1 in doubles. In 2022 he won the deciding match in Ireland's 3–2 win against Barbados in the World Group II competition.