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Sinner said he would be "100% fit" to face Djokovic, but the Serb has not been quite so definitive and cancelled a scheduled practice session on Thursday.

The same terminology was used for murderous Serb militia during Bosnia's conflict.

But Djokovic's struggles continued, with the Serb eventually falling to a sixth break point in a marathon second game to set the tone for a topsy-turvy second set.

The Serb appeared to struggle early in the third set - later confirming that "something was off with the stomach" - but rediscovered his form following a medical timeout to win 10 of the final 12 games.

Ultimately he was more consistent than his higher-ranked opponent - Kecmanovic hit 33 winners to Evans' 22, but the Serb's 42 unforced errors were almost double the number made by the Briton.