Katie Jill O'Brien is a British former professional tennis player from Beverley, Yorkshire. She was briefly the British No. 1 tennis player, and reached her career-high singles ranking of world No. 84 on 1 February 2010. She won four singles and two doubles titles on the ITF Circuit.

Melanie Jayne South is a former English tennis player. She won six singles and 24 doubles titles on the ITF Circuit. On 2 February 2009, she reached her best singles ranking of world No. 99. On 9 March 2009, she peaked at No. 120 in the doubles rankings.