21 year old David Berbers has been sentenced to 11 years and a further three years on license.
A 16 year old girl reported that he raped and sexually assaulted her on several occasions between December 2017 and March 2018.
Officers found he was a suspect in another attack on a 15-year-old girl and he was subsequently arrested and charged.
Police believe there may be more victims and urge anyone with information to come forward.
Detective Constable Hannah Saunders of Public Protection Unit which covers south west London led the investigation and said: “These young women have both been through a terrible ordeal. I would like to commend them for their courage and resilience. It is because of their testimony that this evil man is now behind bars and I hope this will bring them some closure.
“Unfortunately we cannot be sure there are not more victims who are yet to come forward. I would encourage anyone with information to get in touch so we can give you the support you need and investigate any further crimes.
“We take all allegations of this nature very seriously and you will be listened to and supported.
“If you would like to report any offences, call 101 or the independent charity Crimestoppers on 0800 555 111 if you would prefer to remain anonymous.”