Scarlets delivered a dominant derby performance to claim their first victory of the Rainbow Cup campaign, beating the Ospreys 22-6, at a rain-soaked Parc y Scarlets.

Prop Alex Jeffries scored the only try of the match, with full-back Leigh Halfpenny delivering a typically dead-eyed goal-kicking display in atrocious conditions.

The platform was laid by the Scarlets pack, with skipper Ken Owens, Blade Thomson and Aaron Shingler to the fore; man of the match Kieran Hardy mixed up his game intelligently, while a much-improved defensive display saw the visitors restricted to just two kicks at goal from fly-half Luke Price.

It was the Ospreys who opened the scoring with a penalty from the boot of Price on two minutes, but the Scarlets responded strongly with Halfpenny levelling on 17 after the visitors were caught offside.

The outstanding Jonathan Davies looked like he made it over the whitewash after bursting through a couple of tackles, but the television match official adjudged the Wales centre had lost the ball as he slid over the whitewash and the score was chalked off.

Nevertheless, the Scarlets continued to boss proceedings.

With the Ospreys falling foul of Scottish referee Ben Blain, Halfpenny added a couple more penalties and an impressive half for the home side was capped when Jeffries crossed two minutes before the interval

A well-worked line-out move saw Davies burst onto a pass from Owens, breaking through a couple of tackles before feeding the tight-head prop on his inside.

Jeffries still had plenty to do, but showed a superb turn of pace to race clear 20 metres to the whitewash to touch down against his former side.

That made it 16-3 at half-time with the Scarlets seemingly in firm control.

The visitors, looking for their first PRO14 win at Parc y Scarlets since 2015, did enjoy more of the game in the second period.

Price reduced the arrears with a penalty and it needed some superb defence to keep the Ospreys line-out maul at bay.

Another Halfpenny penalty five minutes from time extended the lead to 22-6 to ensure a comfortable victory and a seasonal double over our arch rivals.