Roger Federer has set the winning example to reach the semifinals of the Swiss Indoors with a 4-6, 6-1, 6-3 comeback victory over upset-minded Frenchman Adrian Mannarino in Basel.
The challenger, who had not won from 10 previous sets against the world men's No2 and stood 0-4 in their series, suddenly found his game to shock the top seed by winning Friday's opening set in 30 minutes.
But that merely compelled Federer to shift his mighty game into a higher gear as he broke twice in each of the last two sets to score the come-from-behind victory.
Federer advanced with a break in the final game as he fired a textbook passing shot to take the win.
He will next face either US fifth seed Jack Sock or No3 David Goffin for a place in his 13th career final at his hometown event.