The 1991 IBM ATP Tour was the elite tour for professional men's tennis organized by the ATP Tour. The IBM ATP Tour included the Grand Slam tournaments, the ATP Championship Series, Single-Week, the ATP Championship Series, the ATP World Series and the ATP Tour World Championships. The World Team Cup, Davis Cup and Grand Slam Cup are included in this calendar but did not count towards the Tour.

Jan Stefan Edberg 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. 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.