Question: What nationality was the woman who was first-seeded and won the singles title in The 1997 Porsche Tennis Grand Prix?
Sentence (from "Martina Hingis"): Martina Hingis (born 30 September 1980) is a Swiss professional tennis player, a former world No. 1 singles player and currently ranked world No. 2 in doubles by the WTA.
Relevant evidence: Yes