World No.1 Jannik Sinner was stunned by Alexander Bublik 3-6, 6-3, 6-4 in the second round at the Halle grass-court tournament on Thursday.

Bublik, currently ranked 45th in the world but been as high as No 17, ended Sinner's streak of wins since Cincinnati 2024, a period in which he had lost only to Alcaraz in Beijing, Rome and, in that incredible final at Roland Garros earlier this month.

Sinner began brightly as he sailed into a 3-0 lead on his way to winning the first set, but eventually came unstuck as Bublik hit 36 winners, including 15 aces.