Table:
text: Martina Hingis career statistics
WTA Tier I :19 finals (13 titles, 6 runner-ups)
WTA Tier I :19 finals (13 titles, 6 runner-ups)
Outcome Year_ Championship Surface Partner Opponents Score
Winner 2000 Tokyo, Japan Carpet Mary Pierce Alexandra Fusai Nathalie Tauziat 6–4, 6–1
Winner 2000 du Maurier Open Hard Nathalie Tauziat Julie Halard-Decugis Ai Sugiyama 6–3, 3–6, 6–4
Winner 2000 Barilla Indoors Hard Anna Kournikova Kimberly Po Anne-Gaëlle Sidot 6–3, 6–4
Runner-up 2000 Kremlin Cup Hard Anna Kournikova Julie Halard-Decugis Ai Sugiyama 4–6, 6–4, 7–6 (7–5)

Question: Name the surface for Nathalie Tauziat during Martina Hingi's career stats WTA Tier I :19 Finals (13 titles, 6 runners-up). ?