Ключевые слова: 2019, athlete, backhand, ball, billie, center, ceremony, championship, coach, competition, court, federer, flushing, forehand, game, grand, hard, ivan ljubicic, jean, king, match, national, net, new, ny, nyc, open, player, points, practice, professional, racket, roger, roger federer, set, singles, slam, sport, sports, stadium, swiss, switzerland, tennis, tournament, training, uniqlo, us, us open, volley, york,