The 2003 WNBA season was their fifth season and their first in Connecticut. The Sun made the playoffs for the first time since 2000. They would sweep the Charlotte Sting in the first round, only to get swept to the eventual champion Detroit Shock in the conference finals.
In the first round of the Eastern Conference Playoffs, the Sun had to face the Charlotte Sting. Since the Sting had the better record, the series would be played with game 1 at Connecticut, game 2 at Charlotte, and game 3 (if needed) at Charlotte. The Sun swept the Sting and advanced to the second round. In the second round of the Eastern Conference Playoffs, the Sun had to face the Detroit Shock. Since the Shock had the better record, the series would be played with game 1 at Connecticut and games 2 and 3 (if needed) at Detroit. The Shock swept the Sun and game 3 was not needed.