Liam Williams was sent off after joining fellow Wales internationals Jonathan Davies, Leigh Halfpenny, Johnny Williams and Gareth Davies in returning at Cardiff City Stadium
Richard Hodges took charge of Cardiff Blues ahead of Dai Young officially succeeding John Mulvihill next Monday
Keelan Giles returned from injury in the final quarter after almost 15 months for Ospreys at Dragons
The game ended in disappointment for Dragons as they failed to gain a losing bonus point
Dragons 10-13 Ospreys
The Dragons opt for the driving maul which edges closer and closer to the try-line before it is dragged down by the Ospreys.
Another penalty to the Dragons and again the hosts opt to kick to touch. Will that prove to be the right decision?
Dragons 10-13 Ospreys
Elliot Dee is on early in the second half for Dragons, in place of Richard Hibbard.
Harrison Keddie wins a Dragons penalty at the breakdown, the hosts opt to kick to the corner instead of taking the points.
Dragon 10-13 Ospreys
And we're back underway at Rodney Parade.
HT: Dragons 10-13 Ospreys
Adrian Hadley
Former Wales international on BBC Radio Wales
It's pretty entertaining actually - the Ospreys have tried to keep the ball in hand.
Mat Protheroe has looked sharp. George North has looked sharp.
Again, the Dragons have tried to keep up with the Ospreys by keeping the ball in hand, but their execution has not been brilliant.
HT: Dragons 10-13 Ospreys
The players and coaches are making their way back out at Rodney Parade.
More of the same in the second half please!
HT: Dragons 10-13 Ospreys
Gareth Griffiths
BBC Sport Wales at Rodney Parade
An entertaining half. In fact probably the most exciting 40 minutes of the Welsh derbies so far with the lead going back and fore.
Ospreys started and finished the period well with Dragons, inspired by Jamie Roberts' attacking running lines, shading the middle periods.
All to play for in the second-half at a very cold Rodney Parade.
HT: Dragons 10-13 Ospreys
Allow Twitter content?
This article contains content provided by Twitter. We ask for your permission before anything is loaded, as they may be using cookies and other technologies. You may want to read Twitter’s cookie policy, external and privacy policy, external before accepting. To view this content choose ‘accept and continue’.
HT: Dragons 10-13 Ospreys
Gareth Griffiths
BBC Sport Wales at Rodney Parade
Wales have some second-row injury issues ahead of the start of the Six Nations with Alun Wyn Jones, Jake Ball and Will Rowlands all struggling.
After being left out of the Autumn Nations Cup, Adam Beard has been outstanding for Ospreys and will be in contention for Wales coach Wayne Pivac in 2021.
Beard has already stolen a Dragons lineout tonight. One to watch.
The Dragons are penalised again at the breakdown, this time Ashton Hewitt is the guilty party for not releasing the ball.
The Ospreys end the half with an attacking line-out in Dragons territory but a knock on brings the first half to its conclusion.
Time to put the kettle on, we'll be back shortly for the second half at Rodney Parade.
Stephen Myler
It's all Ospreys now to end the half, much as it started.
Dragons are caught offside under their own posts and the Ospreys opt to take the easy points, which Stephen Myler gratefully kicks over.
Dragons 10-10 Ospreys
Not a good sign for Dragons, as scrum-half Tavis Knoyle limps off the field. On comes Rhodri Williams in his place.
Mat Protheroe, con Stephen Myler
Sustain the pressure Ospreys did as Mat Protheroe scampers over in the corner to score the visitors' first try of the match.
There was some lovely build up play from Wales wing George North, who showed his strength to push back a handful of Dragons defenders.
Stephen Myler successfully kicks the conversion from the tightest of angles, and Ospreys are level.
Image source, Huw Evans AgencyDragons 10-3 Ospreys
Spare a thought for the ground staff at Rodney Parade.
The already less-than-perfect playing surface will need to be ready to go again tomorrow evening when Newport County host Brighton in their FA Cup third round match.
Image source, Huw Evans AgencyDragons 10-3 Ospreys
Well after a quiet opening 10 minutes from the hosts they have burst into life now and deservedly lead.
The Ospreys, who have been guilty of starting slowly in recent weeks, will need to withstand this pressure while Luke Morgan sits out the remainder of his time in the sin bin.
Jared Rosser, con Josh Lewis
And the Dragons take advantage of the extra man immediately.
Jamie Roberts is really enjoying himself out there so far with a number of powerful carries.
And Jared Rosser is the beneficiary on this occasion, the wing picks the ball up after a classic Roberts run to cross in the corner.
Image source, Huw Evans AgencyDragons 3-3 Ospreys
Speaking of penalties, here is another and with it a yellow card.
With Jared Rosser free out wide on the right Luke Morgan intentionally knocks the ball on to stop the attack, referee Dan Jones brandishes the yellow card.
Image source, Huw Evans AgencyLuke Morgan does not seem to agree with his sin-binning
Dragons 3-3 Ospreys
The penalty count is already going up quickly here, the Ospreys guilty on this occasion of holding onto the ball in the ruck.
Josh Lewis will have the chance to set up an attacking line-out from a promising position here.
Dragons 3-3 Ospreys
Rhys Webb is involved again, this time passing the ball straight into referee Dan Jones.
No harm done though, Ospreys will have the scrum just inside Dragons' territory.
Dragons 3-3 Ospreys
Rhys Webb's attempted box kick inside his own 22 is blocked by Tavis Knoyle but the Dragons scrum-half then knocks the ball on and Ospreys clear their lines.
Dragons 3-3 Ospreys
We've got a bit of a kicking tennis at the moment. It all ends in a line-out for Ospreys just outside their 22.