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.
Los Angeles, USA Tokyo, Japan Indian Wells, United States Miami, United States Charleston, United States Berlin, Germany Rome, Italy Toronto, Canada Moscow, Russia Zürich, Switzerland † Henin became the 13th World #1 in the history of women's tennis after her victory in the Zurich Open final.