The 26-year-old lasted just 60 minutes into his eagerly anticipated comeback game as the Scarlets were beaten by Edinburgh 21-15 in their first Celtic League fixture. Jones had not played since picking up a groin injury in the 11-9 Six Nations win over England in February.
And the heartbreak of missing the remainder of Wales's famous Grand Slam has been compounded by the news that he will now miss the autumn internationals. Despite having an operation on Tuesday, Jones will not have recovered in time to face New Zealand, South Africa, Australia and Fiji later this year.
"It's hugely disappointing for us but more importantly it's a devastation as far as Daf is concerned," said Scarlets director of rugby Gareth Jenkins. "It was a big comeback this season for him, something he's really been looking forward to having missed most of last season and the celebrations that went with the RBS Six Nations win.
"He took a knock which resulted in a ligament snapping in his finger which then detracted into his arm. There was no alternative really - it was either losing the use of that finger or having surgery to bring the ligament back into the finger and repairing it."
Beating Merthyr has boosted Carmarthen Quins hopes of reaching a top eight spot in the Principality Premiership. Quins captain Haydn Pugh is delighted with his team's progress and is determined that everyone from the Under 6s through to the senior team, enjoys the ride.
When the Wales squad were asked to nominate individuals who played a big part in their early playing days, Wales and Dragons full back and wing Hallam Amos thought of his former Monmouth School rugby coach John Bevan.
Sam Cross and Luke Treharne have been named as co-captains of the Wales Sevens side as head coach Gareth Williams names his 12-man squad to play in the first leg of the HSBC World Series in Dubai next weekend.
Bedwas head coach Steve Law and players Nicky Griffiths and Alun Rees extol the virtues of the close knit club as they prepare to host third place RGC 1404 - who are one place head of them on the Principality Premiership points table - on Saturday.
Many of the Wales squad have said Diolch (thank you) to someone who played an important part in their early playing days by nominating them to be invited to the Wales v South Africa match. One person, Gowerton Comprehensive geography teacher Mr Dean Mason was nominated by two of his former pupils, Dan Biggar and Sam Davies.
The second WRU disability rugby pilot has been delivered, this time in Caerphilly schools, culminating in a festival at the Caerphilly Centre of Sporting Excellence, Ystrad Mynach tomorrow. Plans are in place to set up a Disability Rugby Club in Newbridge to provide long-term playing opportunities.
WRU TV: Hear from inside the Wales camp as Neil Jenkins discusses this weekend's clash with South Africa and how the squad are looking to put in a strong performance to round of the 2016 Under Armour Series