Ai Sugiyama is a Japanese former tennis player. She reached the world No. 1 ranking in women's doubles on the WTA Tour and had a career-high singles ranking of world No. 8, achieved on February 9, 2004. In her career, she won six singles and 38 doubles titles, including three Grand Slam titles (one with Julie Halard-Decugis and two partnering Kim Clijsters), and one Grand Slam mixed doubles title (partnering Mahesh Bhupathi). Sugiyama held the all-time record, for both male and female players, for her 62 consecutive Grand Slam main-draw appearances, until she was surpassed by Roger Federer at the 2015 Wimbledon Championships.

In 1993, at age 17, Sugiyama played tennis legend Martina Navratilova in her native city, losing in three sets. The same year, she made her Grand Slam debut at Wimbledon but lost in the first round to world No. 30, Gigi Fernández, in three sets. In 1994, Sugiyama again reached the main draw at Wimbledon but lost to world No. 6 and compatriot, Kimiko Date. Later that year, she reached her first singles final in Surabaya but was forced to retire against Elena Wagner. She went on to win the Japan Open doubles, her first tour title. Later that year, she broke into the WTA top 100. In 1995, she won her first Grand Slam match and reached the fourth round of Roland Garros. In the first round, the Japanese player defeated 15th-seeded Grand Slam runner-up and former top-5 player Helena Suková by 9–7 in the final set, her first victory over a top-20 player. Two months after, she defeated Amanda Coetzer to reach the third round, while losing to world No. 4 and former Wimbledon champion, Conchita Martínez. In November, she made an impressive run at the Oakland Tier-II tournament. While she was only ranked 63, she defeated 22nd-ranked Irina Spîrlea, former Wimbledon runner-up Zina Garrison Jackson, and No. 10, Lindsay Davenport to reach the second final of her career, where she lost to No. 7, Magdalena Maleeva. After this run, Sugiyama broke into the top 50.