Was that pic from the exhibition tournament held at the end of 1997 in Germany? The Veltins Masters of Champions. At the time, everyone in the pic except Anke was in the top ten, except Anke won the tournament (which was in the format of the ATP Masters Series) beating then-dominant Hingis 7-5 in the fifth set.
I think Irina Spirlea also played the tournament, as did....Novotna? I can't remember. There were eight players.