Conor Benn remains unbeaten after unanimous win over Peter Dobson

The 27-year-old from London is unable to fight in the UK due to failed drug tests.

Conor Benn poses after defeating Peter Dobson in a welterweight boxing match in Las Vegas. (John Locher, AP)

Conor Benn saw off the challenge of American Peter Dobson in Las Vegas with a unanimous decision victory to keep his unbeaten record.

The 27-year-old from London, who is unable to fight in the UK due to failed drug tests, won his second straight fight in the US as he went 12 rounds for the first time in his career.