The 2003 NASDAQ-100 Open was a tennis tournament played on outdoor hard courts. It was the 19th edition of the Miami Masters and was part of the Tennis Masters Series of the 2003 ATP Tour and of Tier I of the 2003 WTA Tour. Both the men's and women's events took place at the Tennis Center at Crandon Park in Key Biscayne, Florida in the United States from March 17 through March 30, 2003.

Finals

Men's singles

🇺🇸 Andre Agassi defeated 🇪🇸 Carlos Moyá 6–3, 6–3

Women's singles

🇺🇸 Serena Williams defeated 🇺🇸 Jennifer Capriati 4–6, 6–4, 6–1

Men's doubles

Roger Federer / 🇧🇾 Max Mirnyi defeated 🇮🇳 Leander Paes / 🇨🇿 David Rikl 7–5, 6–3

Women's doubles

Liezel Huber / 🇧🇬 Magdalena Maleeva defeated 🇯🇵 Shinobu Asagoe / 🇯🇵 Nana Miyagi 6–4, 3–6, 7–5