Graf played when the courts were a good deal faster, with a super reliable slice that was a weapon on grass - much more reliable than Henins 1HBH, which could leave her on occasion, especially when conditions changed. We often forget that Henin beat Serena 6 times - 4 of which were slams. So she is no slouch even by modern standards. Still, tho, Seles's problems opened the door for Henin to dominate. We can't really argue that. And Graf hammered Seles more often than not, even if it was a younger Seles most of those times. We may also forget that Graf appeared on the scene during the transitory phase of tennis from the old game of wooden racquets and the modern game with graphite. She was sort of like the Guga of the WTA. Navratilova was similar with her graphite Yonex, except she had started to age by this time(but do yourself a favour and look at her wiki - she is still the most amazing tennis player in history). Graf came in using a graphite racquet and a more modern forehand than other WTA players. One of her first major victories was using her Dunlop against Evert who was using a wood stick. In the end, all sportsmen are products of their times. Well, Except mebbe Pete Rose and Nolan Ryan, who would both dominate today. Still, tho, Henin is a thing of beuty to watch, whereas Graf appeals more to Novak fans who like grinders.