Four-time Olympic gold medal winner Sir Chris Hoy and Jason Kenny, the defending champion, advanced to the sprint semi-finals at the Track Cycling World Championships - where the room-mates are poised to meet each other.
Hoy claimed a 2-1 win over Robert Forstemann of Germany and Kenny beat France's Kevin Sireau by the same margin.
Just one of the duo can represent Britain at the London Olympics under the one rider or team per nation per event rule - but both are in the world's top four four months out from the Games.
Hoy's win in the decider with Forstemann was by a tiny margin and was only confirmed after a photo finish.
Kenny, meanwhile, proved his strong form by ousting the world-record holder.
France's Gregory Bauge, the 2009 and 2010 world champion, who was stripped of last year's title for an anti-doping offence, is set to meet Australia's Shane Perkins in the second semi-final.
Bauge beat Germany's Stefan Boetticher 2-0, while Perkins advanced 2-1 at the expense of Mickael Bourgain, after the Frenchman was relegated in the deciding race.