Roglic retains Tour lead, Kragh Andersen wins stage 19
Sam Bennett inched further ahead in the struggle for the green jersey by beating rival Peter Sagan, who failed in two bids to leave the Irishman behind.
After three days ascending Alpine mountains this stage had been described as an easy day for the overall contenders, and so it proved.
This was not the case for Deceuninck-Quick Step sprinter Bennett however, who fended off the seven-time green jersey Sagan in their close-run contest over the remaining sprint points.
Sagan made a bid for glory from 20km out but Bennett was able to keep up as an escape group formed from which Andersen then launched his lightning strike from six kilometres out.
The peloton behind them slowed to a snail's pace as many of the lesser riders realised their contribution to this Tour was essentially over due to the nature of the final two stages.
An individual time-trial on Saturday will see Roglic and his rivals for the yellow jersey race solo over 36km.