Over the past year, Draper has made monumental progress to become one of the most feared players on the ATP Tour.
His Grand Slam breakthrough came at the US Open and was backed up by runs to the last 16 of the Australian Open and now in Paris.
But Sinner, 23, and Alcaraz, 22, have a stranglehold on the majors, having won the past five Grand Slams between them.
The British number one conceded it was “really difficult” not to get the opportunity to assess his level over five sets against his good friend Sinner in Paris.
Draper has much less Grand Slam experience than the leading stars, while also having only 168 Tour-level matches under his belt compared to Sinner’s 356 and Alcaraz’s 300.
“I’m a long way behind those boys. I still have lots to learn,” Draper said.
“They’re probably a year or two years ahead of me and have obviously achieved a lot more.
“If you look at how many ATP matches they’ve played, they’ve played double the amount I have.
“I do have a lot to do to catch up with them.”