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total number of titles (a doubles title won by two players representing the same nation counts as only one win for the nation);
cumulated importance of those titles (one Grand Slam win equalling two WTA 1000 wins, one year-end championships win equalling one-and-a-half WTA 1000 win, one WTA 1000 win equalling two WTA 500 wins, one WTA 500 win equalling two WTA 250 wins);
a singles > doubles > mixed doubles hierarchy;
alphabetical order (by family names for players).
Grand Slam tournaments
WTA 1000 (Mandatory)
WTA 1000 (Non-mandatory)
Titles won by player
Titles won by nation
The following players won their first main circuit title in singles, doubles, or mixed doubles:
The following is a list of notable players (winners of a main tour title, and/or part of the WTA Rankings top 100 in singles, or top 100 in doubles, for at least one week) who returned from retirement or inactivity during the 2021 season:
The following is a list of notable players (winners of a main tour title, and/or part of the WTA Rankings top 100 in singles, or top 100 in doubles, for at least one week) who announced their retirement from professional tennis, became inactive (after not playing for more than 52 weeks), or were permanently banned from playing, during the 2021 season:
Gréta Arn(born 13 April 1979 in Budapest, Hungary) joined the professional tour in 1997 and reached a career-high ranking of No. 40 in singles in May 2011 and No. 175 in doubles in December 2000. She won two singles titles in her career. 
Timea Bacsinszky(born 8 June 1989 in Lausanne, Switzerland), has won four WTA singles titles in her 15-year career, where she reached a career high of No.9, and five doubles titles. She reached the semifinals of French Open in singles in 2015 and 2017. She also won a silver medal in doubles with Martina Hingis at 2016 Rio Olympics. Bacsinszky announced her retirement on 16th July due to constant injuries. 
Kiki Bertens(born 10 December 1991 in Wateringen, Netherlands). The former World No.4 and highest-ranked Dutchwoman in WTA history has won 10 singles and 10 doubles titles in her career. Her best result in a grand slam was reaching the semifinals of 2016 French Open in singles. She announced on 16 June 2021 that 2021 will be her final season and the 2021 Tokyo Olympics her last tournament.
Nicole Gibbs(born 3 March 1993 in Cincinnati, United States) joined the professional tour in 2013 and reached a career-high ranking of No. 68 in singles in July 2016 and No. 107 in doubles in September 2016. She announced her retirement in February 2021 after battling with oral cancer in 2019 and plans to attend law school.
Vania King (born 3 February 1989 in Monterey Park, California, United States) turned professional in 2006 and reached a career high ranking of 50 in singles and 3 in doubles. King reached three WTA singles finals during her career, winning one of them at the Bangkok Open in 2006. She was most known as a doubles specialist, winning fifteen titles in her career, with her biggest achievements coming in winning the women's doubles events at both Wimbledon and the US Open in 2010, alongside Yaroslava Shvedova. King was hampered by an ankle injury throughout the final years of her career, and despite undergoing surgery in 2017, King decided to retire in February 2020 however due to the impacts from the COVID-19 pandemic, she officially retired in April 2021 following a farewell tour.
Carla Suárez Navarro (born 3 September 1988 in Las Palmas de Gran Canaria). In April 2021, Suárez Navarro announced that her cancer was in complete remission, and that she would commence a farewell tour beginning at Roland-Garros and culminating in a final US Open appearance.