Possible Clues:

• Three-time U.S. Open winner Ivan
• Ivan with three U.S. Open wins
• Ivan —, tennis player
• Ivan --, tennis player born in Ostrava, Czechoslovakia
• Three-time French Open champ
• McEnroe contemporary
• Tennis great who never won Wimbledon
• Three-time U.S. Open champion
• Court figure Ivan
• ''Hitting hot'' practitioner