The incident happened in Sutton High Street just before 8.40pm yesterday (May 24).
Officers were called to the scene and found a man in his 20s injured.
Two men, aged 18 and 23, were arrested on suspicion of actual bodily harm.
They were taken to a west London police station where they currently remain.
Police enquiries are ongoing.
A spokesperson for Metropolitan Police said: “Police were called at 8.37pm on Wednesday, 24 May to reports of a fight between a group of males at High Street, Sutton.
“Officers attended. At the scene a male, aged 20s, was found with facial injuries. His injuries were not life threatening.
“Two males, aged 18 and 23, were arrested on suspicion of actual bodily harm [ABH].
“They were taken to a west London police station where they remain at this time.
“Enquiries are ongoing.
“Anyone who witnessed this incident or has footage should call police on 101 or Tweet @MetCC quoting 7658/24MAY.
“To remain 100% anonymous call the independent charity Crimestoppers on 0800 555 111 or visit Crimestoppers-uk.org.”
