ATP Grand Prix Tennis circuit
When the Open Era began in 1968, there were tennis tournaments which started as a part of the newly created professional tours - a series of tournaments for the strongest male tennis players to compete with each other. The most successful was the Grand Prix one, which eventually integrated all the rival circuits. The Grand Prix of the tennis circuit tournaments were held from 1970 to 1989, later they were transformed to the ATP Tour. The list of the Grand Prix tournaments is not complete. We are doing our best to make it as complete as possible.