A second half try by Jamie Robinson and five points from the boot of Iestyn Harris were not enough to save the Blues as they went down 31-10 to Munster at Musgrave Park in Cork.
To complete the Blues' woes Tom Shanklin was yellow-carded in a first half when they felt the full force of referee Iain Ramage's whistle and, after the break, replacement hooker Andrew Lewis was carried off with what appeared to be a leg injury.
Cardiff Blues were crowned the Welsh champions of the Premiership Rugby 7s Series on Saturday night to book a place at the Series Final on Friday, August 8 - and you can join them with tickets on sale NOW!
Wales will tonight (Saturday) stage the first leg of the Premiership Rugby 7s Series this Saturday evening at the BT Sport Cardiff Arms Park - and tickets remain on throughout the day and right up until kick-off so you can join us for an summer night of top class rugby!
In its sixth year the Blues Cup once again showed to be huge hit throughout the region and is a great advert for the community game as each of the six finalists across the three age groups produced rugby of an outstanding level resulting in 14 tries.
Inspired Cardiff Blues enjoyed Judgement Day at the Millennium Stadium as they secured a tense 17-13 win over regional rivals Scarlets in a feisty and enthralling encounter in the RaboDirect PRO12 on Easter Sunday.