Stefan Bengt Edberg (born 19 January 1966) is a Swedish former professional tennis player. A major practitioner 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 is one of only two men in the Open Era to have been ranked world No. 1 in both singles and doubles (the other being John McEnroe). 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 1984 Olympic tournament, was ranked in the singles top 10 for ten successive years, and ranked nine years in the top 5. After retirement, Edberg began coaching Roger Federer in January 2014, with this partnership ending in December 2015.