A 20-year-old man is waiting for facial surgery after he was "viciously" attacked as he got out of a taxi in the early hours of the morning.
The assault happened on Rattray Street in the Tollcross area of Glasgow at about 0130 GMT.
The man had emerged from the taxi with two friends when he was attacked. He was taken to Glasgow Royal Infirmary where his condition is stable.
Strathclyde Police have appealed to the attacker's friends to hand him in.
The suspect is described as white, between 19 and 22 years old, about 5ft 5in and 5ft 7in tall and of medium build.
He was wearing light-coloured track suit trousers and a dark jacket.
He made off with two other men, neither of whom were involved in the assault, towards Downfield Street.
Det Con David Reilly said: "This was a vicious attack on a young man who has been left with serious facial injuries and it is vital we trace the person responsible."