Postpublished at 08:33 Greenwich Mean Time 20 January 2019
Federer 2-2 Tsitsipas*
Tsitsipas looks irked as he whacks a forehand long and then Federer comes racing forward, rushing Tsitsipas behind the baseline.
Bam. Body serve from Federer for 40-0, and a ripper down the line hands him a swift hold.
* denotes next server