John Isner

Thiem was able to break the tall American on his first chance in the second set and then once more in the third, defeating Isner 3-6, 6-3, 6-4

In stark contrast to second seed Roger Federer, who produced an error-strewn performance in defeat to Kei Nishikori on Sunday, Djokovic hit just six unforced errors and won 86 per cent of points on his serve, making a mockery of the apparent challenging nature of the playing surface.