Sabatini defeated Martinez 61 62 and Seles 63 62 to win her third title. Navratilova, the 3rd seed, was thwarted by Martinez 63 64 in the quarters.
I want to mention that Gabriela Sabatini probably played some of her best tennis at this event, and her game in the 1991 and 1992 finals is some of the best tennis I've ever seen. She lost early in her last appearances in 1994 and 1995, but from 1987 to 1993, out of 7 events, she won four and reached two finals and a semi. Really impressive, considering she beat the number 1 player 3 times (1987 Navratilova and Seles in 1991 and 1992).
In 1991 her game was flawless, and these were her rivals and the scores:
R32 Coetzer, Amanda (RSA) 6-2 6-2
R16 Tauziat, Nathalie (FRA) 6-0 6-1
Q Capriati, Jennifer (USA) 6-0 6-2
S Martinez, Conchita (ESP) 6-1 6-0
F Seles, Monica (USA) 6-3 6-2