Australia 45-17 Ireland 

Ireland's second game in Pool B of the Under 20 World Championship ended in defeat after a second-half blitz from Australia overwhelmed an Irish side who played with 14 men for an hour of the game.

Noel McNamara's men rallied either side of half-time, leading 17-0 briefly in the second half before the Junior Wallabies blew them away.

The match started badly for Ireland, Will Harrison kicking an early penalty before Ireland's Ryan Baird was red-carded for a high tackle on Harrison.

Down to 14 men, Ireland were soon 10 points in arrears as Siona Tui touched down in the left corner after 25 minutes.

Craig Casey's try before half-time gave Ireland a glimmer of hope heading into the second half, despite replays suggesting the scrum-half had been held up.

Ireland drew level courtesy of a Jake Flannery penalty after the referee reversed a decision following some 'goading' from Australian players, clapping in the face of Irish opponents.

Minutes later Ulster centre Stewart Moore scored Ireland's best try of try of the game, slaloming through the Australian defence, to open up a 17-10 lead. 

However the lead did not last long as Isaac Lucas sped through the Irish rearguard to bring the Junior Wallabies back to 17 apiece before Mark Nawaqanitawase was set up for the lead try by full-back Lucas.

Harrison nailed the conversion from the sideline to make it 24-17.

Then came the moment of the match and the sealing score. The towering 19-year-old Nick Frost claimed the resulting restart, turned on his heels, burst a couple of tackles and returned the kick-off for a try -a remarkable display of athleticism, strength and speed from the replacement lock. That made it 31-17 after three tries in five minutes.

Harrison scored a 77th-minute breakaway try to add an exclamation point to the result before Frost ran in a second try and competed the rout.