Hingis was 19 in this match. This has to have been the absolute low point of her career. Not only because it was such an embarrassing episode, but becuase it was to be potentially the high point of her career. She was the dominate player on the WTA tour that year. She had the Australian in her pocket and thinking grand slam. Graf was at the end of the road and hadn't won much in awhile, and wasn't expected to do much at that French Open.
So Hingis wins the first set gets up a break and it completely falls apart from there. After losing a close second set in which was 2 points from the match, and being constantly jeered and booed by the French crowd, she went to the back of the court for about 2 or 3 minutes, leaned against the backdrop and looked like she was crying. THen she put up little resistance against Graf in the third went back to the locker room and probably had a fit or crying jag or something. The trophy ceremony was delayed about 15 or 20 minutes while her mom had to go in and get her to come out and accept the runner up trophy.
I think that episode was the beginning of the road to semi retirement for her.