This page covers all the important events in the sport of tennis in 2003. Primarily, it provides the results of notable tournaments throughout the year on both the ATP and WTA Tours, the Davis Cup, and the Fed Cup.
Virginia Ruano Pascual and Paola Suárez were defending champions, and won in the final 6–4, 7–5, against Svetlana Kuznetsova and Elena Likhovtseva.
Kim Clijsters and Ai Sugiyama were the defending champions, however Clijsters did not compete.
Kim Clijsters and Ai Sugiyama were the defending champions, but Clijsters chose not to participate. Sugiyama played alongside Liezel Huber, but they lost in the first round to Shinobu Asagoe and Rika Fujiwara.
Virginia Ruano Pascual and Paola Suárez were the two-time defending champions, but were defeated in the final by Kim Clijsters and Ai Sugiyama 7–6(7–5), 2–6, 7–9.
Svetlana Kuznetsova and Martina Navratilova were the defending champions, but chose not to participate that year.
This article refers to the sport of tennis.
Serena and Venus Williams were the defending champions, but lost in the third round to Elena Dementieva and Lina Krasnoroutskaya.
Lisa Raymond and Rennae Stubbs were the defending champions but they competed with different partners that year, Raymond with Lindsay Davenport and Stubbs with Elena Bovina.
Virginia Ruano Pascual and Paola Suárez defeated Kim Clijsters and Ai Sugiyama in the final, 6–4, 3–6, 6–3 to win the doubles tennis title at the 2003 WTA Tour Championships.
Serena and Venus Williams defeated Virginia Ruano Pascual and Paola Suárez in the final, 4–6, 6–4, 6–3 to win the women's doubles tennis title at the 2003 Australian Open. It was their second Australian Open title together and sixth major title together overall.
Serena and Venus Williams defeated Lindsay Davenport and Corina Morariu in the final, 6–2, 4–6, 6–4 to win the women's doubles tennis title at the 2001 Australian Open. It was the Williams sisters' fourth major doubles title, and they completed the career Golden Slam in doubles with the win.
Virginia Ruano Pascual and Paola Suárez were the defending champions and won in the final 6–2, 6–3, against Svetlana Kuznetsova and Martina Navratilova in straight sets. This was Ruano Pascual's 4th career Grand Slam doubles title and her 2nd title at the US Open. It was also Suárez' 4th career Grand Slam doubles title and her 2nd title at the US Open.
Lisa Raymond and Rennae Stubbs were the defending champions, but lost in third round to Kim Clijsters and Meghann Shaughnessy.
Virginia Ruano Pascual and Paola Suárez were the defending champions, but lost in quarterfinals to Els Callens and Émilie Loit.
Elena Dementieva and Janette Husárová were the defending champions, but had different outcomes. Dementieva had to withdraw due to a left foot strain, while Husárová teamed up with Elena Likhovtseva and reached the semifinals.
Lisa Raymond and Rennae Stubbs were the defending champions, but lost in semifinals to Virginia Ruano Pascual and Paola Suárez.
Kim Clijsters and Ai Sugiyama were the defending champions, but none competed this year. Clijsters was injured on her left wrist, while Sugiyama decided to focus on the singles tournament.
Maria Sharapova and Tamarine Tanasugarn were the defending champions, but none competed this year.
Elena Dementieva and Janette Husárová were the defending champions, but both players competed in this edition with different partners. Dementieva teamed up with Lina Krasnoroutskaya, while Husárová teamed up with Conchita Martínez. Both teams were eliminated by Virginia Ruano Pascual and Paola Suárez in the first round and quarterfinals, respectively.
Kim Clijsters 
Ai Sugiyama 
Virginia Ruano Pascual 
Paola Suárez 
