1989 Grand Prix (tennis)  The 1989 Nabisco Grand Prix was the only tennis circuit for male players held that year. It incorporated the four grand slam tournaments, one World Championship Tennis tournament and the Grand Prix tournaments. The table below shows the 1989 Nabisco Grand Prix (to become known in 1990 as the ATP Tour). List of players and Grand Prix singles titles won, alphabetically by last name:   The following players won their first career title: