When Jack Draper had to retire injured from his Australian Open match against Carlos Alcaraz, some people asked the same old questions.
Was the Briton's body built for success at the top of a physically demanding sport? Could he get over the line mentally in career-defining moments?
Eight weeks later, Draper has answered any lingering critics.
On Sunday, he won the biggest title of his career at Indian Wells. He has also cracked the world's top 10 for the first time.
This is how the 23-year-old has done it.