Roger Federer offered no excuses for his shock defeat by David Goffin in the last four of the ATP Finals. The Swiss superstar seemed a near certainty to claim a seventh end-of-season crown due to the absences of Andy Murray and Novak Djokovic, and the early withdrawal of Rafael Nadal, as well as his own stunning form this year. Federer had only lost four matches in 2017 and was facing a man who had taken just two sets off him in their previous six meetings. But defeat number five - Goffin coming from a set down to triumph 2-6, 6-3, 6-4 - denied Federer the chance to register an eighth title win of the year, and a 96th career victory.

Roger Federer reacts after losing the second set to David Goffin in the semi-finals of the ATP World Tour Finals on Saturday. Pic/Getty Images