Table:
text: 1997 ATP Super 9
Singles
Singles
Tournament Surface Week Winner_and_score Finalist Semifinalists
Indian Wells Hard March 10 Michael Chang 4–6, 6–3, 6–4, 6–3 Bohdan Ulihrach Jonas Björkman Thomas Muster
Key Biscane Hard March 17 Thomas Muster 7–6(6), 6–3, 6–1 Sergi Bruguera Pete Sampras Jim Courier
Monte Carlo Clay April 21 Marcelo Ríos 6–4, 6–3, 6–3 Àlex Corretja Carlos Moyá Fabrice Santoro
Hamburg Clay May 5 Andriy Medvedev 6–0, 6–4, 6–2 Félix Mantilla Tommy Haas Yevgeny Kafelnikov
Rome Clay May 12 Àlex Corretja 7–5, 7–5, 6–3 Marcelo Ríos Alberto Berasategui Goran Ivanišević
Montréal Hard July 28 Chris Woodruff 7–5, 4–6, 6–3 Gustavo Kuerten Michael Chang Yevgeny Kafelnikov

Question: What type of surface was played on during the week of March 17th at the 1997 ATP Super 9?