Ivan Lendl is a baseball player.
The Association of Tennis Professionals ( ATP ) was formed in September 1972 by Donald Dell , Bob Briner , Jack Kramer , and Cliff Drysdale to protect the interests of male professional tennis players . The Grand Prix Super Series of men 's tennis tournaments , formed part of the Grand Prix and World Championship Tennis tours between 1970 and 1989 , and were held annually throughout the year in Europe , North America , Africa and Asia . The Grand Slam tournaments , also called majors , are the four most-important annual tennis events . Ivan Lendl . Before the formation of the ATP , Lendl reached a record 12 year-end championships ( equalled by John McEnroe ) .