A group of teenagers have faced court accused of bashing and robbing foreign tourists visiting Melbourne for the Australian Open, leaving one US man seriously injured.

Five teenagers, including one who was on bail, have been charged by the Melbourne’s Embona Robbery Taskforce following two separate robberies in Melbourne's CBD on Wednesday night.

Charge sheets allege one of the teenagers intentionally caused serious injury to a victim in circumstances of “gross violence’’ in that at the time of the assault the victim was “incapacitated’’.

Police allege in one incident a 52-year-old man and 17-year-old boy, both from the United States, were bashed and robbed in the Queen Victoria Gardens just after 11pm.

The two US citizens have been identified as highly acclaimed American doctor Edmund Pribitkin and his teenage son Edik.