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Samson Lee, Steff Evans and James Davies scored first-half tries for Scarlets
Dragons replied with two of their own through Jared Rosser and Taine Basham
Johnny McNicholl sealed the bonus-point before Tom Rodgers and Dane Blacker also scored for Scarlets
Adam Warren scored a late consolation try for the Dragons, as Scarlets ended up winning 41-20
Dragons 15-19 Scarlets
Scarlets' have another powerful maul but this time the Dragons hold up Johnny Williams and the ball is ripped away.
Can they keep the Scarlets out until Harrison Keddie's return? They've not long left before he returns.
Dragons 15 -19 Scarlets
Kalamafoni is adjudged to have been part of the ruck and the try is ruled out.
The Dragons are awarded a penalty and clear their lines.
Dragons 15-19 Scarlets
Sione Kalamafoni on his first Scarlets start goes over the top for a try. But referee Craig Evans is checking if he was part of the ruck.
Dragons 15-19 Scarlets
Keddie receives a yellow card for collapsing the maul. Can the Scarlets capitalise on their man advantage?
Dragons 15-19 Scarlets
Last week's try-scorer Leon Brown is on for the Dragons.
The visitors win a penalty on the halfway line and once again opt for the attacking line-out.
Dragons 15-19 Scarlets
Wales and Dragons centre Jamie Roberts thinks it will be a one-score game as the home side get things going.
HT: Dragons 15-19 Scarlets
The Scarlets have three of the four tries they are looking for if they're to stand any chance of making the semi-finals.
Glenn Delaney's men need the full five points this afternoon and hope Munster get nothing from their final fixture against Connacht tomorrow.
HT: Dragons 15- 19 Scarlets
It's the 13th time the Dragons have trailed at the break this season in the Pro14.
But they have won the second half in their last five Welsh derbies, including those comeback wins against the men from West Wales.
Gareth Griffiths
BBC Sport Wales at Rodney Parade
A flourishing first-half at Rodney Parade with five tries and plenty of attacking rugby.
Scarlets will be happy with their set-piece with scrummaging superiority and three tries from Samson Lee, Steff Evans and James Davies coming initially from driving lineouts.
Dragons have recorded tries from wing Jared Rosser and flanker Taine Basham and have been inspired by Wales centre Nick Tompkins in attack. More of the same hopefully in the second-half.
Taine Basham
Dragons win the line-out, Wainwright collects and Basham is over! His 6th try in the Pro14 this season, his 9th in all competitions.
Sam Davies fails to add the extras.
Dragons 10-19 Scarlets
Rhodri Williams clears and the Dragons are back in possession.
Scarlets concede penalty at breakdown and Sam Davies opts to kick to touch.
It comes to nothing but they go to the corner again after the Scarlets are again penalised.
Dragons 10-19 Scarlets
The Scarlets' set-piece is proving a real weapon!
Another penalty, another attacking line-out in Dragons' 22, perhaps another try?
James Davies
And they've got it!
The drive gets going and Cubby boy scores!
Jones misses from the tee for the first time this afternoon.
Dragons 10-14 Scarlets
Dragons are getting a talking to from the referee about penalties at the breakdown. Scarlets on the hunt for another try.
Dragons 10-14 Scarlets
It's end to end stuff at Rodney Parade. Dragons back on the attack before Rosser knocks on and allows us all a chance to catch our breath.
Dragons 10-14 Scarlets
Gareth Griffiths
BBC Sport Wales at Rodney Parade
It is quite frenetic here at Rodney Parade with three tries in quick succession, two for the Scarlets and one for the Dragons.
Contrasting scorers with two wings Jared Rosser and Steff the "Mullet" Evans used to crossing the opposition line, while prop Samson Lee celebrates scoring only his second ever.
Both sides are throwing the ball around looking for tries and are gaining rewards.
Steff Evans, con Dan Jones
Steff Evans pounces on another chance for his third try in two games.
Breathless stuff here in the last 10 minutes.
Image source, Huw Evans Picture AgencyJared Rosser, con Sam Davies
Game on! When Dragons can exert pressure and limit errors in the opposition's 22 they look dangerous. Basham with a sweeping pass to Rosser.
Davies accurate from the tee.
Dragons 3-7 Scarlets
A new mentor in Ben Franks, a fresh return from injury, perhaps a chance to get back in the Wales number three shirt?
Samson Lee, con Dan Jones
Image source, Huw Evans Picture AgencySamson Lee picks and goes for the game's first try. Scarlets are looking dominant in the scrum and with the driving maul off lineouts.
Dan Jones with the extra two points.