Federer finds fountain of youth

'Old guy' Roger turns back calendar in gutting out quarterfinal triumph

When Roger Federer stood on the dusty baseline with the scoreboard showing he was trailing Marin Cilic 6-7, 4-6, 3-3, 0-40, it looked like the man with the dodgy back was about to disappear into a giant Wimbledon sinkhole.

When the self-styled "old guy" of tennis stood match point down at 4-5 30-40 in the fourth set, it looked like he would be sucked deeper into the mire.