The ATP Tour is the elite tour for professional tennis organized by the ATP. The 2001 ATP Tour included the four Grand Slam tournaments, the Tennis Masters Cup, the Tennis Masters Series, the International Series Gold and the International Series.

This is the complete schedule of events on the 2001 ATP Tour, with player progression documented from the quarter-final stage.

List of players and titles won (Grand Slam and Masters Cup titles in bold), last name alphabetically:

The following players won their first title:

Titles won by Nation:

ATP Rankings

The Association of Tennis Professionals or ATP was formed in 1972 by Donald Dell, Jack Kramer, and Cliff Drysdale to protect the interests of male professional tennis players. Since 1990, the association has organized the worldwide tennis tour for men and linked the title of the tour with the organization's name. In 1990 the organization was called the ATP Tour, which was renamed in 2001 as just ATP and the tour being called ATP Tour. In 2009 the name was changed again and is now known as the ATP World Tour. It is an evolution of the tour competitions previously known as Grand Prix tennis tournaments and World Championship Tennis (WCT). The ATP's Executive Offices are in London, United Kingdom. ATP Americas is based in Ponte Vedra Beach, United States; ATP Europe is headquartered in Monaco; and ATP International, which covers Africa, Asia and Australasia, is based in Sydney, Australia.

The counterpart organization in the women's professional game is the Women's Tennis Association.

Started in 1972 by Jack Kramer, Donald Dell, and Cliff Drysdale. It was first managed by Jack Kramer, as Executive Director, and Cliff Drysdale, as President. Jack Kramer created the professional players' rankings system, which started the following year and continues to this day. From 1974 to 1989, the men's circuit was administered by a sub-committee called the Men's Tennis Council. It was made up of representatives of the International Tennis Federation (ITF), the ATP, and tournament directors from around the world.

Ronald Jean-Martin Agénor (born November 13, 1964 in Rabat, Morocco) is a former professional tennis player who represented Haïti during his playing career. He is known as the only Haitian to have ever earned a top-25 world ranking.

The son of a diplomat, Agénor was born in Morocco and lived there for ten years. He then lived in Zaïre for four years, before moving to Bordeaux, France at the age of 14. He was ranked the World No. 8 junior tennis player in 1982. He turned professional in 1983.

In 1989, Agénor reached the quarter-finals of the French Open (where he was knocked-out by eventual-champion Michael Chang), and won his first top-level singles title at Athens. He reached his career-high singles ranking of World No. 22 that year. In 1990, Agénor won two further tour singles titles at Berlin and Genoa.

In 1999, Agénor finished the year ranked World No. 98 and became the first player aged over 35 to finish in the top-100 since Jimmy Connors in 1992.

Agenor's father is Frédéric Agénor, who was a United Nations diplomat for over 20 years before becoming Haïti's Minister of Agriculture in the 1980s. Ronald has two sisters and three brothers, including Pierre-Richard Agenor, an economist and professor of International Macroeconomics and Development Economics at the University of Manchester, and Patrick Agenor, a cardiologist living in France.

Michael Detlef Stich (born October 18, 1968 in Pinneberg, Schleswig-Holstein) is a former professional tennis player from Germany. He is best remembered for winning the men's singles title at Wimbledon in 1991. He also won the men's doubles titles at both Wimbledon and the Olympic Games, and was a singles runner-up at the 1994 US Open and the 1996 French Open. Stich won 18 singles titles and 10 doubles titles. His career-high singles ranking was World No. 2 in 1993.

Stich was raised in Elmshorn, Schleswig-Holstein. He turned professional in 1988 and won his first top-level singles title in 1990 at Memphis, Tennessee.

Stich won Wimbledon in 1991. He defeated the defending champion and World No. 1 Stefan Edberg in the semifinals, 4–6, 7–6, 7–6, 7–6, without breaking his service once. Then in the final, he beat his compatriot and three-time Wimbledon champion Boris Becker in straight sets.

In 1992, Stich teamed with John McEnroe to win the men's doubles title at Wimbledon in a five-set and five-hour final that stretched into Monday (the day after the tournament normally ends) and ended with a 19–17 final set. Then at the Summer Olympic Games in Barcelona, Stich teamed with Becker to win the men's doubles gold medal. Stich also won the 1992 Grand Slam Cup, defeating Michael Chang in the final.

Peter "Pete" Sampras (/ˈsæmprəs/; born August 12, 1971) is a retired Greek–American tennis player and former world number 1. During his 15-year tour career, he won 14 Grand Slam singles titles and became recognized as one of the greatest tennis players of all time.

Sampras debuted on the professional tour in 1988 and played his last top-level tournament in 2002 when he won the US Open, defeating rival Andre Agassi in the final. He was the year-end world no. 1 for six consecutive years (1993–1998), a record for the open era. His seven Wimbledon singles championships are also an Open Era record. He spent 286 weeks at no. 1, the most of any male player. His five US Open singles titles is an Open Era record shared with former world no. 1 players Jimmy Connors and Roger Federer. Sampras is the last American male to win Wimbledon (2000) and the ATP World Tour Finals (1999).