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.
The 1994 Croatia Open Umag was a men's tennis tournament played on outdoor clay courts in Umag, Croatia that was part of the World Series of the 1994 ATP Tour. It was the fifth edition of the tournament and was held from 22 August through 29 August 1994. First-seeded Alberto Berasategui won the singles title.
The 1995 Monte Carlo Open was a men's tennis tournament played on outdoor clay courts and took place at the Monte Carlo Country Club in Roquebrune-Cap-Martin, France, near Monte Carlo, Monaco. The event was part of the ATP Championship Series, Single-Week of the 1995 ATP Tour. It was the 89th edition of the tournament and was held from 24 April through 30 April 1995. Ninth-seeded Thomas Muster won the singles title, his second title at the event after 1992. It was the closest Becker ever got to winning a clay court tournament, as he missed a match point on his own serve with a double-fault in the fourth-set tiebreaker.
The 1995 Croatia Open Umag was a men'tennis tournament played on outdoor clay courts in Umag, Croatia that was part of the World Series of the 1995 ATP Tour. It was the sixth edition of the tournament and was held from 21 August through 28 August 1995. First-seeded Thomas Muster won his third singles title at the event after 1992 and 1993.
The 1990 Monte Carlo Open, also known by its sponsored name Volvo Monte Carlo Open, was a men's tennis tournament played on outdoor clay courts. It was the 84th edition of the Monte Carlo Open, and was part of the ATP Championship Series, Single-Week of the 1990 ATP Tour. It took place at the Monte Carlo Country Club in Roquebrune-Cap-Martin, France, near Monte Carlo, Monaco, 23 April until 29 April 1990. The men's field was headlined by Stefan Edberg and Boris Becker. Andrei Chesnokov, who was seeded 12th, won the singles title.
The 1991 Newsweek Champions Cup and the Virginia Slims of Palm Springs were tennis tournaments played on outdoor hard courts. It was the 18th edition of the tournament, and was part of the ATP Super 9 of the 1991 ATP Tour, and of the Tier II Series of the 1991 WTA Tour. It was held from March 2 through March 16, 1991.
The 1990 ATP Athens Open was a men's tennis tournament played on outdoor clay courts in Athens in Greece that was part of the World Series of the 1990 ATP Tour. It was held from 1 October through 7 October 1990. Seventh-seeded Mark Koevermans won the singles title.
The 1991 OTB International Open was a combined men's and women's tennis tournament played on outdoor hard courts that was part of the World Series of the 1991 ATP Tour. It was the fifth edition of the tournament and was held in Schenectady, New York in the United States from August 19 through August 26, 1991. Michael Stich and Brenda Schultz won the singles titles.
The 1997 Croatia Open Umag was a men's tennis tournament played on outdoor clay courts in Umag, Croatia that was part of the World Series of the 1997 ATP Tour. It was the eighth edition of the tournament and was held from 21 July until 27 July 1997. Third-seeded Félix Mantilla won the singles title.
The 1991 Torneo Godó was the 39th edition of the Torneo Godó annual men's tennis tournament played on clay courts in outdoor Barcelona, Catalonia, Spain and part of the Championship Series of the 1991 ATP Tour. It was the 39th edition of the tournament took place from 8 April through 14 April 1991. Seventh-seeded Emilio Sánchez won the singles title.
The 2014 ATP Vegeta Croatia Open Umag was a men's tennis tournament played on outdoor clay courts. It was the 25th edition of the Croatia Open, and was part of the ATP World Tour 250 Series of the 2014 ATP World Tour. It took place at the International Tennis Center in Umag, Croatia, from 21 July through 27 July 2014. Unseeded Pablo Cuevas, who entered the main draw as a qualifier, won the singles title.
The 1992 Mercedes Cup, was a men's tennis tournament played on outdoor clay courts and held at the Tennis Club Weissenhof in Stuttgart, Germany that was part of the Championship Series of the 1992 ATP Tour. It was the 15th edition of the tournament was held from 13 July until 19 July 1992. Unseeded qualifier Andrei Medvedev won the singles title.
The 1992 Philips Open was a men's tennis tournament played on outdoor clay courts at the Nice Lawn Tennis Club in Nice, France, and was part of the ATP World Series of the 1992 ATP Tour. It was the 21st edition of the tournament and took place from 13 April through 19 April 1992. Unseeded Gabriel Markus, who defeated top-seeded Pete Sampras in the semifinal, won the singles title.
The 1989 Ebel German Open was a men's tennis tournament that was part of the Super Series of the 1989 Nabisco Grand Prix circuit. It was the 80th edition of the event and was played on outdoor clay courts at the Am Rothenbaum in Hamburg, West Germany from 8 May until 15 May 1989. The final was postponed to Monday, 15 May due to rain during the weekend. First-seeded Ivan Lendl won the singles title, his second at the event after 1987, and earned $135,000 first-prize money.
The 1991 Campionati Internazionali di Sicilia was a men's tennis tournament played on outdoor clay courts in Palermo, Italy that was part of the World Series of the 1991 ATP Tour. It was the 13th edition of the tournament and took place from 23 September until 29 September 1991. Unseeded Frédéric Fontang won the singles title.
The 1993 Croatia Open was a men's tennis tournament played on outdoor clay courts in Umag, Croatia that was part of the World Series of the 1993 ATP Tour. It was the fourth edition of the tournament and was held from 23 August until 29 August 1993. First-seeded Thomas Muster won his second consecutive singles title at the event.
The 1992 Croatia Open was a men's tennis tournament played on outdoor clay courts in Umag, Croatia that was part of the World Series of the 1992 ATP Tour. It was the third edition of the tournament and was held from 24 August until 30 August 1992. First-seeded Thomas Muster won the singles title.
The 1999 Croatia Open, also known as the International Championship of Croatia-Umag, was a men's tennis tournament played on outdoor clay courts in Umag, Croatia that was part of the World Series of the 1999 ATP Tour. It was the tenth edition of the tournament and was held from 26 July until 1 August 1999. Eighth-seeded Magnus Norman won the singles title.
The 1991 Philips Austrian Open, also known as the Austrian Open Kitzbühel, was a men's tennis tournament held on outdoor clay courts at the Kitzbüheler Tennisclub in Kitzbühel, Austria that was part of the ATP World Series of the 1991 ATP Tour. It was the 21st edition of the tournament and was held from 29 July until 4 August 1991. Third-seeded Karel Nováček won the singles title.
Goran Prpić was the defending champion, but did not compete this year.
Dimitri Poliakov [1] 
Gilad Bloom / 
Javier Sánchez [2] 