DEFENDING champion Jannik Sinner extended his winning streak at the ATP Finals with another victory over Ben Shelton today.

The Italian is yet to drop a set after three round-robin matches and his 6-3 7-6 (3) win against Shelton made it 29 successes in a row on indoor hard courts.

It was a familiar feeling for American Shelton, who fell to 0-3 on his debut at the tournament having lost to Sinner for the eighth time in a row and fourth this year.

“When you come here and win all three round-robin matches you have to play a very high level, some great tennis, which I’ve done,” said Sinner, who shrugged off the loss of a match point at 5-4 in the second set to dominate the tie-break, on Sky Sports.

“I felt like serving, I’ve done very well in important moments, brought me to this point. The mental aspect was great until now so let’s see what’s coming tomorrow.”

Tomorrow, Sinner will face Alex De Minaur in the semi-finals after the Australian scraped into the last four by just one game ahead of Taylor Fritz.

De Minaur must try to get the better of Sinner for the first time in 13 attempts, and the Wimbledon champion said: “I have to be very careful. He doesn’t have a lot to lose. I have a lot to lose, so it’s going to be very difficult.”

British success in the doubles continued with Henry Patten and his Finnish partner Harri Heliovaara booking their spot in the last four thanks to a 7-6 (5) 6-2 win over fourth seeds Marcelo Arevalo and Mate Pavic.

Patten joins all-British pairs Julian Cash and Lloyd Glasspool and Joe Salisbury and Neal Skupski in the last four — the first time five players from one country have reached the semi-finals since 1992.