Ключевые слова: athlete, athletic, atp, atp world tour, ball, clay, clay court, competition, court, cup, federer, fitness, game, healthy, istanbul, istanbul open, male, man, match, outdoor, outdoor clay courts, play, player, playing, professional, racket, racquet, roger, roger federer, singles, sport, sports, teb bnp paribas istanbul open, tennis, tournament, turkey,