Katie Jill O'Brien (born 2 May 1986) is a British former professional tennis player from Beverley, Yorkshire. She was briefly the British No. 1 tennis player. She reached her career-high singles ranking of World No.84 on 1 February 2010 and won four ITF singles titles and two ITF doubles titles.In 2007, she reached the second round of her home Grand Slam, Wimbledon, by beating Sandra Klösel in round one. She lost to the No.31 seed, Michaëlla Krajicek, in the second round. In 2010, she replicated this achievement by beating Patricia Mayr to reach the second round of the Australian Open where she fell to 8th seeded Jelena Janković. Wikipedia
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