Stefan Bengt Edberg (Swedish pronunciation: [ˈsteːfan ²eːdbærj]; born 19 January 1966) is a Swedish former world No. 1 professional tennis player (in both singles and doubles). A major proponent of the serve-and-volley style of tennis, he won six Grand Slam singles titles and three Grand Slam men's doubles titles between 1985 and 1996. He also won the Masters Grand Prix and was a part of the Swedish Davis Cup-winning-team four times. In addition he won four Masters Series titles, four Championship Series titles and the unofficial Olympic tournament 1984, was ranked in the singles top 10 for ten successive years, and ranked 9 years in the top 5. Edberg began coaching Roger Federer in January 2014, with this partnership ending in December 2015.