2003 WTA Tier I Series
| Details | |
|---|---|
| Duration | January 27 – October 29 |
| Edition | 14th |
| Tournaments | 9 |
| Achievements (singles) | |
| Most titles | Justine Henin (4) |
| Most finals | Justine Henin (4) |
← 2002 2004 → | |
The WTA Tier I events are part of the elite tour for professional women's tennis organised by the WTA called the WTA Tour.