Wawrinka could not convert four of them in the second set , whacking his racket twice on the net in frustration .
Wawrinka made the most of Wawrinka 's fifth chance Wawrinka 's his sixth of the match - on set point to level the tie .
Wawrinka could not convert four of them in the second set , whacking his racket twice on the net in frustration , but he made the most of his fifth chance - his sixth of the match - on set point to level the tie .