
Last year at the same stage it was Shelton, ranked 16, who was victorious, but today the Italian looked confident from the start as he won 6-4, 7-6(7/1) in 88 minutes.
Sinner pulled ahead in the ninth game of the first set, breaking when Shelton hit long, then dominated the second set tiebreak.
“It was very tough, you don’t have so much control when you play against him … I just tried to stay strong mentally,” said Sinner.
Other big names in action today are world No 2 Carlos Alcaraz, who beat Sinner in the China Open final a week ago, as well as four-time Shanghai champion Novak Djokovic and world No 3 Alexander Zverev.