Japan have pulled off the mother of all Rugby World Cup shocks by beating Ireland 19-12 at the Shizuoka Stadium to blow Pool A wide open.
Rugby round up Newsletter
Ireland had looked set to top the group after easing past their biggest rivals Scotland last week, heavily fancied to win the remainder of their matches with ease.
However, the tournament hosts dominated their opponents after going behind early on and produced a stunning second half display to run out deserved winners.
Japan, of course, edged South Africa 34-32 four years ago in the last World Cup but, in front of their home supporters, this is a victory that will take an extra-special place in Japanese sporting history.
The result leaves Japan top of the group with two wins from two and puts the Brave Blossoms right in the fight for a place in the quarter-finals.
Ireland, who picked up a losing bonus point, are three points behind and need Scotland to beat Japan in order to top the group and avoid a clash with New Zealand in the first knock-out game.
If the Scots do beat the hosts in the final pool game on October 13, it's likely that the three teams would have won three and lost one of their pool matches, putting progression to the last eight down to bonus points.
Two cheeky Jack Carty kicks had helped Ireland into the driving seat mid-way through the first half.
After Yu Tamura missed an early penalty opportunity to put Japan ahead, Carty kicked towards the corner, where Garry Ringrose climbed high to claim the ball, spin inside and touch down the opening try.
Carty then set up the second try at the end of concerted pressure. The Ireland out-half chipped the ball up and dashed forward to rise highest highest knock it down into the path of the on-rushing Rob Kearney, who managed to push his way over the line.
The score by then was 12-3 but, 20 minutes later, Ireland were just relieved to reach half-time ahead. The hosts piled on the pressure, camped in opposition territory for the final 10 minutes of the half, their rewards coming through two more Tamura penalties - the second an impressive kick from range.
When Carty's restart was long, Japan had the put-in on a halfway scrum as the gong sounded. Moving the ball impressively once again, Lomano Lemeki was inches from touching down in the corner, the grubber kick just not bouncing up enough for the winger to be able to claim it.
Japan's belief was growing and half-time didn't allow Ireland to reset as they would have hoped.
Rather the hosts were stronger than ever at the start of the second half and deservedly took the lead when replacement Kenki Fukuoka found space on the outside to run in. The hosts had been awarded a scrum inside the 22 when Chris Farrell ran into CJ Stander, causing an accidental offside. There was an air of inevitability, given the ease with which they had bullied Ireland's scrum a few minutes before, and when the pressure mounted, Japan worked the ball cross-field for Fukuoka to finish.
Tamura would add the extras and, after a period of convincing defence denied Ireland a sniff of a score, the fly-half converted a 72nd minute penalty to take his side seven clear.
Ireland were even close to being denied a vital losing bonus point as Fukuoka intercepted and led a late break, hauled down before he could reach the line.
Japan piled on the pressure and, when the hooter had gone, Carty booted the ball into touch, a nod to Japan's dominance and the important of bonus points in a new-look Pool A.