Jessica Andrews and Beth Potter sealed qualification for the Rio Olympics in the 10,000 metres in Highgate on Saturday night.
The 23-year-old Andrews, a relative unknown, smashed her personal best to win the Highgate Harriers Night of the 10,000m PBs race, the Olympic trial, in 31 minutes 58 seconds, inside the qualifying standard of 32mins 15secs.
Potter took the other automatic qualifying spot on offer by finishing second Briton, having already achieved the standard for Rio.
But 42-year-old mother-of-two Jo Pavey's hopes of going to a fifth Olympics suffered a blow at the Parliament Hill athletics track.
She has not got the qualifying standard and could only finish well down the field, leaving her chances of gaining the third 10,000m spot on the Great Britain team all but over. She can still make the team for Rio in the 5,000m, though.
Andy Vernon was also unable to secure qualification for the Games as he came home third Briton in the men's race.
Vernon already has the Olympic standard of 28:00, having run 27:42.62 last May, but failure to finish in the top two has left his Rio hopes in serious jeopardy.
Ross Millington, with winner in 28:27.63, and second-placed Dewi Griffiths will be automatically selected provided they run the qualifying time before the cut-off date of July 11, while double Olympic champion Mo Farah is of course certain to get the third spot on the team.
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