The 18-year-old, from Notting Hill, died in hospital after being attacked in Craneford Way at approximately 4:45pm on Tuesday, 12 October.
A murder investigation has been launched and officers are appealing for witnesses and anyone with information to come forward.
Hazrat’s family have been informed and are being supported by specially trained officers.
A post-mortem examination has been scheduled to take place at Kingston Mortuary on Friday, 15 October.
Detective Chief Inspector Vicky Tunstall, from the Specialist Crime Command, said: “We are still working to establish the motive behind this tragic attack and are following a number of leads.
“Officers have recovered CCTV from the area and spoken to a number of witnesses who described seeing a fight in the moments before Hazrat was attacked.
“We know a lot of people were on the field at the time and I’d urge anyone who has not yet spoken to police to contact us immediately.”
Chief Superintendent Elisabeth Chapple, commander for policing in south-west London, said: “Our thoughts are with the young victim and his family at this awful time. No young person should lose their life in London and we will do all we can to support our colleagues with their investigation.
“Local residents can expect to see an increased police presence in the area. If anyone has any concerns, or information that could help, I encourage them to contact those officers and tell us what they know.”
There have been no arrests.
Anyone who witnessed this incident or has footage is asked to call police on 101 or tweet @MetCC quoting 5697/12OCT. You can also upload evidence here.
Information can also be provided to Crimestoppers, anonymously, by calling 0800 555 111.