No problem with long-matches at Australian Open, says iron-man Roger Federer

Roger Federer showed his 35-year-old legs may yet still carry him to a long-awaited 18th Grand Slam title as he overhauled fifth seed Kei Nishikori in a five-set slog to reach the Australian Open quarter-finals on Sunday. Having issued a reminder of his class in the 90-minute rout of Tomas Berdych, Federer flaunted his endurance by prevailing 6-7(4) 6-4 6-1 4-6 6-3 after a three hour and 26 minute battle under the lights at Rod Laver Arena. After six months out of the game to recover from a knee injury, Federer's fairytale return will continue against giant-killing German Mischa Zverev, who sensationally ousted top seed Andy Murray on the same centre court only hours before. (Video courtesy: SNTV)