Grigor Dimitrov reveals moment he knew Roger Federer was struggling with back injury

Grigor Dimitrov pulled of a shock win over an injured Roger Federer in the US Open quarter-finals, but he knew the 20-time Grand Slam champion was suffering from an issue after the second set.

from Daily Express :: Tennis Feed https://www.express.co.uk/sport/tennis/1173638/Grigor-Dimitrov-Roger-Federer-US-Open-quarter-final-upper-back-injury-tennis
via Express