Martyn Willimas put in a man of the match performance in front of British & Irish Lions coaches Ian McGeechan and Shaun Edwards at Twickenham Stadium as he steered Cardiff Blues to their first trophy as a region.
The Welsh side swept Gloucester aside as they won the ERDF Energy Cup 50-12 with Williams the catalyst for an explosive performance that contained seven tries.
Blues coach Dai Young put the pressure on the Lions selectors, who name their tour party for South Africa on Tuesday, by stating it would be difficult to leave behind a handful of his stars.
"Martyn, Gethin Jenkins, Tom Shanklin, Jamie Roberts and Leigh Halfpenny are all in the mix and they and others are going to be difficult to leave behind given the way they are playing," said Young.
"I couldn't have asked any more from the team than they gave me and it is a great achievement. But this isn't just a result of the hard work of the players, it is down to the efforts of the board, the backroom staff and the fans.
"Our style is to take the game to the opposition and we really went out there and made our intentions clear."
The Blues were 22-5 ahead at the interval and then ran in a further four tries in the second half as Gloucester, who they beat twice in the Heineken Cup Pool stages, were put to the sword.
Lions hopeful Halfpenny grabbed two tries in the opening exchanges to put the Blues on the front foot and Gloucester were chasing shadows after that. Full back Ben Blair also scored two tries as he helped himself to 25 points.
The only cloud for the Blues on an otherwise perfect day was a first minute injury to scrum half Jason Spice. The New Zealander was injured in the first attack of the game when he fractured his ulna in the right arm.
That injury is likely to rule him out of the Heineken Cup semi-final clash against Leicester Tigers at the Millennium Stadium on Sunday, 3 May.
Wales Head Coach Rob Howley talks to WRU TV's Sebastian Barrett about the 36-man squad he has just named for the forthcoming Under Armour series, which includes two uncapped players, Ospreys duo Sam Davies and Rory Thornton.
Head coach Rowland Phillips is deligthed he can now call BT Sport Cardiff Arms Park home for his Wales Women's side, who launch their international season next month with games against Scotland and UK Armed Forces in the heart of the capital city.
Wales Sevens star Sam Cross has put his home town club of Brynmawr on the map after winning a silver medal at the Rio Olympics with Team GB. His club have now honoured him by naming their players bar after him, as WRU TV discovered at the official launch, recently.
One of the newest members of the Principality Premiership, Bargoed admit it's proving to be a steep learning curve at the highest level, but are determined to become a force to be reckoned with. WRU TV visited the club last weekend when they took on Llanelli.
Table-topping Aberavon travel to north Wales to tackle RGC 1404 as both teams defend unbeaten starts to the season in the Principality Premiership. WRU TV's Graeme Gillespie visited the Wizards to see how their preparations were going for the game of the weekend.
The Half a Game initiative is currently sweeping across Wales and proving a major success. The scheme aims to give every young player at least half a game every weekend. WRU TV recently visited a festival in Narberth where clubs have fully embraced the initiative.
Both Bargoed and Swansea were seeking their first win of the Principality Premiership season this afternoon. It proved a fruitful day for the hosts - not only did they win, but Bargoed claimed a try bonus point.
Cardiff managed to keep their unbeaten record at home intact, but only just as Bridgend made them work extremely hard before the Blue and Blacks secured a hard fought Principality Premiership win at the BT Sport Arms Park last night.
Former Wales back row Andy Powell gives a guided tour of The Wern, home of Merthyr RFC, who are determined to prove a lot of people wrong and make their mark in their first season in the Principality Premiership.