Philadelphia's No.1 draft pick Markelle Fultz was helped off the court with an ankle injury in the 76ers' NBA Summer League win over Golden State.
Fultz appeared to roll his left ankle in the second half and was assisted to the locker room by teammates in the 95-93 victory on Saturday night in Las Vegas.
It was the last thing the Sixers wanted to see just when they appeared to be ready to put years of misery behind them.
They have dealt with significant injuries to centre Joel Embiid and last year's No.1 pick, Australian Ben Simmons, over the past three years.
"Oh no no no," Embiid tweeted, "don't do this to us."
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Fultz was taken for X-rays and there was no immediate word on the extent of his injury suffered after scoring eight points in 15 minutes.
The 76ers pulled off a trade with Boston before the draft in June to move up from No. 3 to No.1 to take Fultz, the dynamic scoring point guard that GM Bryan Colangelo felt was the perfect piece to put with Simmons and Embiid.
