Reigning champion Jannik Sinner says he will need to produce his best tennis to get past Alex de Minaur in the semis at the season-ending ATP Finals.

Italy's Sinner extended his winning streak on indoor hardcourt to 29 matches with a 6-3, 7-6 (7/3) victory over American Ben Shelton in their round-robin match at Turin's Inalpi Arena.

He faces de Minaur in the last four, with the Australian coming off a 7-6 (7/3), 6-3 victory over Taylor Fritz .

Earlier this week, de Minaur had been the picture of dejection after feeling he had thrown away a victory against Lorenzo Musetti when in a winning position.

De Minaur recovers to keep ATP Finals hopes alive

Alex de Minaur responds to a crushing loss earlier in the week by toppling America's Taylor Fritz to remain in contention at the ATP Fina

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