For the first two rounds of the Six Nations campaign, England were the king of the pack, but under the cool Cardiff sky, Wales brought a structured attack which was focused on preventing Ben Youngs and Owen Farrell from finding any momentum. Two unbeaten sides, a flawless sunny day and the kind of stage even a leading West End impresario would covet. Here, Sportsmail looks at the key questions ahead of the big game.
It duly produced one of the finest results in the New Zealander's long and increasingly distinguished career.
The Australian insisted this was "the greatest Welsh side ever", but Gatland does not feel his charges are at that level. And the bonus ball? Full credit to Wales'.
It's the match the fans want their team to win more than any other.
Biggar converted from the sideline for 16-13 and then made the scoreline finally reflect Welsh dominance when his crosskick was juggled and caught by wing Josh Adams, who scrambled over the line for their second and final try in the 78th minute.
Gatland paid tribute to his side's fitness but also suggested England have a habit of choking on the big occasion.
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Benfica face Dinamo Zagreb, while Valencia's reward for knocking out Celtic is a tie against FC Krasnodar of Russian Federation . After beating Swedish side Malmo 5-1 on aggregate, they might find the going tougher against Ukrainian giants Dynamo though.
Wales have won their last eight home matches and on Saturday are seeking to beat a century-old national record by winning a 12th successive Test.
Ouch. Gatland and Jones famously shared a curry before the tournament started but the days of shared poppadoms may now be over.
The two coaches have already started the war of words with Eddie Jones claiming this is the best Wales side of all time. To Gatland, however, this was anything but a cosmic fluke.
"Today we weren't quite good enough and there is no embarrassment in that", said Jones.
"You guys were all talking England up, saying there was going to be 15 points in it".
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"The problem with that though is deciding what your starting XV is, and I think that's been a bit of a problem so far in this Six Nations".
Gatland had said in the build up to this Six Nations encounter that England had no idea what Wales animal was going to turn up and he was right.
"In terms of 1 to 23 and then players that aren't involved I think this is possibly the strongest Welsh squad I've seen".
"We got beaten in a certain few areas and we'll improve in those areas and we'll be ready to go when we play next time".
England's Kyle Sinckler (R) with Wales captain Alun Wyn Jones. Could Gatland's men really pull it off?
It was a sentiment summed up in a speech by Wales captain Phil Bennett shortly before the 1977 edition in Cardiff where the outstanding fly-half concluded by telling his side: "We've been exploited, raped, controlled and punished by the English - and that's who you are playing this afternoon". If it wasn't on they would just bash it up again, targeting England's nine and 10 particularly.
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But Wales were their own worst enemies when the ball was knocked free at a maul deep in their own territory after 26 minutes.