Ключевые слова: 2019, action, ao, ao 2019, arena, athlete, atp, australia, australian, backhand, ball, center, champion, championship, court, exercise, forehand, game, laver, match, melbourne, national, net, new, open, overhead, players, points, practice, professional, racket, rod, serena, serena williams, serve, set, singles, slam, sports, stadium, tennis, title, tournament, training, united states, usa, volley, williams,