Draper, currently ranked ninth, demonstrated his potential by defeating Alcaraz and winning the Indian Wells tournament earlier this year.
His season was unfortunately cut short due to bone bruising in his left humerus, leading to his withdrawal from competitions after Wimbledon.
Henman emphasised that Draper's ability to compete with the top two players hinges on him achieving and maintaining full fitness.
The article also highlights Alcaraz's recent dominance over Sinner, with Henman suggesting Sinner needs to develop more variety in his game to counter Alcaraz's diverse playing style.