Roger Federer had to fight hard to hold off Serbia's Filip Krajinovic on Tuesday, edging to a 6-2, 4-6, 6-4 win to reach the second round of the Swiss Indoors.

The eight-time champion flirted with his earliest exit in Basel since his 1998 debut as a teenager, but came out on top in a nervy deciding set. "I was up 6-2, 3-1, it could have ended very quickly," Federer said.