Claim: Martina Hingis is not a citizen of Switzerland.
Evidence: Martina Hingis -LRB- born 30 September 1980 -RRB- is a Czechoslovak-born Swiss professional tennis player who spent a total of 209 weeks as the singles world No. 1.
The Swiss -LRB- die Schweizer , les Suisses , gli Svizzeri , ils Svizzers -RRB- are citizens of Switzerland.