Draper has shown signs of fatigue during previous gruelling matches, but his off-season work is starting to show.
One difference is his breathing.
“I had a lot of problems with my sinuses when I was younger, so I breathe a lot through my mouth,” said Draper.
“When you are anxious or you have long points and have to recover quickly, it’s not efficient to breathe through your mouth.
“I’ve been trying to reverse what I do and breathe through my nose better.”
Former British number one Annabel Croft has also pointed to Draper keeping better control of his emotions.
“Jack is so much calmer on court than he ever was as a junior. Generally across the board, his calmness is quite zen-like,” she told BBC Radio 5 Live.
“Lots of great champions like Bjorn Bjorg and Roger Federer have completely controlled their emotions on the court. It makes a massive difference in saving that energy.”
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