The two matches I remember most from those trips were Steve Davis coming back from 8-2 down against Efren to win (with some amazing shots) and the finals of the Chao vs. Ismael Paez (Morro) match. Everyone remarked on the stillness of Morro's follow-through.

Morro lost by the largest margin recorded for a WC final, 17-6.
The format I saw was round robin in groups of eight with four advancing to the knockout. One year there were irregular betting patterns when a top pro had already cinched advancement and a lot of money was bet on his final RR opponent to win. There was an upset.
Here is the Reyes/Davis match:
"The greatest comeback since Lazarus."