Ключевые слова: action, arena, athlete, atp, australia, australian, backhand, ball, billie, center, championship, competition, court, federer, forehand, game, greece, greek, laver, match, melbourne, national, net, new, nike, open, overhead, player, players, practice, prize, professional, racket, rod, semifinal, serve, set, singles, slam, sport, sports, stadium, stefanos, tennis, title, tournament, training, tsitsipas, us, volley,