The 2005 Miami Masters (also known as the NASDAQ-100 Open for sponsorship reasons) was a tennis tournament played on outdoor hard courts. It was the 21st edition of this tournament, and was part of the ATP Masters Series of the 2005 ATP Tour, and of the Tier I Series of the 2005 WTA Tour. Both the men's and the women's events took place at the Tennis Center at Crandon Park in Key Biscayne, Florida, United States, from March 21 through April 3, 2005.
See main article: 2005 NASDAQ-100 Open – Men's singles. Roger Federer defeated 
Rafael Nadal, 2–6, 6–7(4–7), 7–6(7–5), 6–3, 6–1
See main article: 2005 NASDAQ-100 Open – Women's singles. 
Kim Clijsters defeated 
Maria Sharapova, 6–3, 7–5
See main article: 2005 NASDAQ-100 Open – Men's doubles. 
Jonas Björkman & 
Max Mirnyi defeated Wayne Black & Kevin Ullyett, 6–1, 6–2
See main article: 2005 NASDAQ-100 Open – Women's doubles. Svetlana Kuznetsova & 
Alicia Molik defeated 
Lisa Raymond & Rennae Stubbs, 7–5, 6–7(5–7), 6–2