British lightweight Caroline Dubois retained her WBC world title after her contest with Jessica Camara ended in a frustrating technical draw because of a clash of heads.

On her 24th birthday, Dubois dropped the challenger with a smart, straight left hand in the first round in Sheffield.

The Londoner sensed an early finish and continued to pile on the pressure in the second as blood flowed down from Camara’s left eye after the accidental coming together of heads.

The referee and ringside doctor waved off the contest before the third, ruling the 36-year-old Canadian – whose right eye was also heavily swollen – was not fit to continue.

“The blood wasn’t coming in her face, she didn’t want it,” said Dubois, who won her first 10 pro fights.

“It was either getting stopped by a doctor or I’m stopping it. I wish her well and hope she has a safe flight home.”

Dubois was upgraded from interim to full world champion after Katie Taylor vacated her belt. She has called for a unification fight with Doncaster’s WBO champion Terri Harper next.

Barnsley’s Callum Simpson defended his British and Commonwealth super-middleweight title with a second-round stoppage of Steed Woodall in the main event.

The 29-year-old Simpson sent Woodall to the canvas with a barrage of shots, before the referee intervened after another attack moments later, despite the protests of Woodall, 30.