Ключевые слова: amateur, america, armstrong, athlete, athletic, ball, best, challenge, champion, championship, compete, competition, competitor, day, djokovic, equipment, exercise, flushing, fun, game, kids, kids day, louis, match, nation, nole, novak, open, play, practice, professional, professional tennis, racket, serve, shot, sport, stadium, states, success, summer, tennis, tennis tournament, tournament, training, us, us open, usa, winner, world, york,