Officers were called to a crash, involving a car and a pedestrian, in Pavilion Road, Worthing, at about 8.30pm last night.
Police said two men got out of the vehicle and attacked a man before running off.
The 21-year-old victim, from Essex, was located by officers a few moments later and was rushed to hospital.
He suffered a broken ankle along with other less serious injuries. He remains in hospital fully conscious and under police guard, a police spokesman said.
The road was cordoned off for several hours while police investigated the incident.
Officers have identified two men they wish to speak to following the attack. The investigation is ongoing and enquiries are continuing today.
Anyone with any information is asked to contact 101 quoting reference 139 27/01.
Information can also be reported anonymously to the independent charity Crimestoppers via www.crimestoppers-uk.org or by calling 0800 555 111.
Don’t miss out on all the latest breaking news where you live.
Here are four ways you can be sure you’ll be amongst the first to know what’s going on.
1) Make our website your homepage
2) Like our Facebook page
3) Follow us on Twitter
4) Register with us by clicking on ‘sign in’ (top right corner). You can then receive our daily newsletter AND add your point of view to stories that you read here.
And do share with your family and friends - so they don’t miss out!
Always the first with your local news.
Be part of it.