| 1998 WTA Tier I Series | |
| Duration: | February 2 – October 25 |
| Edition: | 9th |
| Tournaments: | 8 |
| Most Tournament Titles: | Lindsay Davenport Martina Hingis (2) |
| Most Tournament Finals: | Lindsay Davenport Martina Hingis Venus Williams (3) |
| Previous: | 1997 |
| Next: | 1999 |
See main article: article and 1998 WTA Tour.
The WTA Tier I events are part of the elite tour for professional women's tennis organised by the WTA called the WTA Tour.[1]
| Tournament | Country | Location | Surface | Date | Prize money[2] | |
|---|---|---|---|---|---|---|
| Toray Pan Pacific Open | Japan | Tokyo | Carpet (i) | Feb 2 – 8 | $926,250 | |
| State Farm Evert Cup | United States | Indian Wells | Hard | Mar 2 – 15 | $1,250,000 | |
| Lipton Championships | United States | Key Biscayne | Hard | Mar 16 – 29 | $1,900,000 | |
| Family Circle Magazine Cup | United States | Hilton Head Island | Clay (green) | Mar 30 – Apr 5 | $926,250 | |
| Campionati Internazionali d’Italia[3] | Italy | Rome | Clay (red) | May 4 – 10 | $926,250 | |
| German Open[4] | Germany | Berlin | Clay (red) | May 11 – 17 | $926,250 | |
| du Maurier Open | Canada | Montreal | Hard | Aug 17 – 23 | $926,250 | |
| European Championships | Switzerland | Zürich | Carpet (i) | Oct 12 – 18 | $926,250 | |
| MGTS Kremlin Cup | Russia | Moscow | Carpet (i) | Oct 19 – 25 | $1,000,000 |