Felix Auger-Aliassime put a "weird start" speech to hit Ben Shelton and registry his first triumph of this year's ATP Finals.
Canada's Auger-Aliassime came backmost from a mixed first group to hit nan big-serving American 4-6 7-6 (9-7) 7-5 successful Turin.
The 25-year-old was progressively awesome connected service and showed nary signs of nan calf problem that hampered him successful his opening group-match nonaccomplishment to Jannik Sinner.
Eighth seed Auger-Aliassime's triumph intends Italy's Sinner will suffice for nan semi-finals if he thumps Alexander Zverev later connected Wednesday.
Germany's Zverev will only beforehand if he thumps Sinner successful consecutive sets.
Auger-Aliassime quickly recovered himself 4-1 down successful nan first set, pinch Shelton putting nan service and volley to bully use, but he collapsed backmost arsenic his force served for nan set.
However, a mediocre work crippled handed nan inaugural - and nan opener - to 5th seed Shelton.
Shelton had nan only break constituent of nan 2nd group but an progressively assured Auger-Aliassime saved it, earlier clinching nan tie-breaker connected a chaotic double responsibility from Shelton.
A tight 3rd group was besides decided connected nan Shelton serve, pinch Auger-Aliassime converting his 3rd lucifer point.
"He was playing overmuch amended than maine astatine nan start," Auger-Aliassime said.
"It was a weird start, but arsenic nan lucifer went connected I was uncovering ways to put returns successful nan court."
In nan doubles, British brace Joe Salisbury and Neal Skupski hit Henry Patten and Harri Heliovaara to move wrong rubbing region of nan semi-finals.
Salisbury and Skupski hit Britain's Patten and his Finnish partner 7-6 (9-7) 3-6 10-7.
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