Olympic and world champion Mo Farah kept his four-year winning streak over 10,000 metres intact in running the year’s fastest time of 26 minutes, 50.97 seconds at the Prefontaine Classic Diamond League meeting on Friday.

Briton Farah, challenged by Kenyan Paul Tanui, pushed to the front with 350m to go to defeat Tanui, who ran 26:51.86.

Geoffrey Kamworor, also of Kenya, took third in 26:52.65.

“It would have been good to run a little bit faster,” Farah said.

“Training has been going pretty well.

“But it was tough. It was difficult doing it all the way by yourself.

“The pacemakers the first couple of laps were spot on, then it slowed down a lot.

“We were just going back and forth and that’s wasting a lot of energy,” said Farah, who was hoping for a time in the 26:30 range.

His next race will be a 1,500m at next month’s Birmingham Diamond League meeting.

“I don’t know what is going to happen after that,” said Farah, who is undecided on whether to try for another distance double at August’s world championships in Beijing.