Wimbledon commentator Jo is a former British number one who reached a world ranking of 5 in 1983. She first played at Wimbledon in 1977, losing in the first round to eventual champion Virginia Wade, and made her final appearance at the Championships in 1995, retiring after 18 years on the professional circuit. During that time Jo won two tour titles in 1983 at Mahwah New Jersey and Sydney and in the same year also reached the semi-finals of the US Open and Roland Garros.

Jo won seven national titles, reached the ladies' singles quarter-finals of Wimbledon and, with Jeremy Bates, took the mixed doubles title at Wimbledon in 1987 and at the Australian Open in 1991.