Ken is committing an awful lot of errors at the moment - he's letting down the side and he knows it, he gave his racquet a 'gentle tap' on the floor having shoved another backhand return (B/K are really exploiting Ken's seemingly weaker side on return) into the net at 1-4.
So far rather disappointing from Skupski - I imagine that this was the form they were in when beaten by Kontinen/Niemenen. I still wouldn't bank against them though - they seem pretty gutsy..