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Boxing world champion Errol Spence Jr has been involved in a serious car crash in Dallas, Texas.

The 29-year-old was ejected from a Ferrari he was driving at high speed, when it veered over the centre of the road and flipped multiple times, Dallas Police said.

Promoters Premier Boxing Champions said Spencer Jr did not break any bones but suffered "some facial lacerations".

He is in a "stable condition" and "expected to make a full recovery".

The cause of Thursday's crash at 2:53am local time on 500 S Riverfront Blvd is undetermined.

The white Ferrari was travelling northbound, and crossed over the centre median on to the southbound lanes.

Police said Spence Jr, the only person in the car, had not been wearing a seatbelt.

He is now "resting with his family by his side" in a Dallas hospital.

"Spence is awake and responding and his condition is listed as stable," said his representatives.

"The Spences want to thank everyone for their prayers and well wishes and are extremely grateful to the Dallas first responders who rushed to the scene and the doctors who are taking care of him."

American welterweight Spence Jr beat Shawn Porter on a split decision to unify the IBF and WBC world titles on 29 September, leaving the Texan unbeaten after 26 fights.

Messages of support have been sent on social media by Porter, Terence Crawford who holds the WBO welterweight title, and Manny Pacquiao who holds the division's WBA belt.

Britain's Kell Brook, who lost the IBF title to Spence Jr in 2017, and WBC president Mauricio Sulaiman also tweeted their support.