Wing Williams' defence also denied the Blues as he brought Blair down after a poor Biggar clearance allowed James to launch a counter-attack.

BBC: Blues 20-12 Ospreys

Tries from Jamie Roberts and James and two nerveless conversions from Ben Blair completed a remarkable comeback, before a scoreless extra time led to the competition's first shoot-out.

BBC: Young feels for tearful Williams

But James went over for a try, converted by Blair, and fellow winger Jamie Roberts went over the gameline a second time before the break.

BBC: Edinburgh 0-20 Blues