2003 Tennis Masters Cup
| 2003 Tennis Masters Cup | |
|---|---|
| Date | November 8 – November 16 |
| Edition | 34th (singles) / 29th (doubles) |
| Champions | |
| Singles | |
 Roger Federer | |
| Doubles | |
 Bob Bryan / Mike Bryan | |
The 2003 Tennis Masters Cup was a tennis tournament played on outdoor hard courts. It was the 34th edition of the year-end singles championships and the 29th edition of the year-end doubles championships, and was part of the 2003 ATP Tour. It took place at the Westside Tennis Club in Houston, Texas in the United States from November 8 through November 16, 2003.
Champions
Men's Singles
Roger Federer defeated Andre Agassi 6–3, 6–0, 6–4
- It was Federer's 9th title of the year and the 17th of his career. It was his 1st career year-end championships title.
Men's Doubles
Bob Bryan / Mike Bryan defeated 
Michaël Llodra / Fabrice Santoro 6–7(6–8), 6–3, 3–6, 7–6(7–3), 6–4
- It was Bob Bryan's 5th title of the year and the 14th of his career. It was Mike Bryan's 5th title of the year and the 16th of his career.