| 2005 J&S Cup | |
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| Date | April 25 – May 1 |
| Edition | 10th |
| Champions | |
| Singles | |
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| Doubles | |
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The 2005 J&S Cup was a Tier II event on the 2005 WTA Tour that run from April 25 - May 1, 2005. It was held in Warsaw, Poland, and was the 10th year that the event was staged.Justine Henin-Hardenne won her first Warsaw title and second overall of the year.
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
The following players received entry as Lucky Losers:
Justine Henin-Hardenne def.
Svetlana Kuznetsova, 3-6, 6-2, 7-5
Tatiana Perebiynis /
Barbora Strýcová def.
Klaudia Jans /
Alicja Rosolska, 6-1, 6-4