Kaia Kanepi (Estonian pronunciation: [ˈkɑi.ɑ ˈkɑnepi]; born 10 June 1985) is an Estonian professional tennis player. She achieved her career-high ranking of world No. 15 on 20 August 2012 and has won four singles titles on the WTA Tour. Described as a 'resident Grand Slam upset specialist' by The Guardian – with 19 wins over seeded players in the first week of Grand Slams; only two active players (Victoria Azarenka and Venus Williams) have more.
https://en.wikipedia.org/wiki/Kaia_Kanepi