Juventus 2 Sampdoria 1: Ronaldo at the double as champion saved by VAR

Cristiano Ronaldo's double saw Juventus edge past Sampdoria and finish the first half of the Serie A season unbeaten.

Cristiano Ronaldo celebrates against Sampdoria

Two goals from Cristiano Ronaldo and a dramatic late VAR call gave Juventus a 2-1 win over Sampdoria on Saturday that extends its lead at the top of Serie A.

Having rescued its unbeaten start to the league season with the equaliser against Atalanta last time out, Ronaldo struck in each half to secure a 17th win in 19 games heading into the mid-season break.

Sampdoria, which had levelled through Fabio Quagliarella's penalty and had an injury-time Riccardo Saponara strike disallowed by VAR, has now lost its last four away league games against Juve for the first time since 1968.

The only negative for Juve was the loss of goalkeeper Wojciech Szczesny to an apparent injury in the warm-up.

Ronaldo draws first blood

Samp's resistance lasted less than two minutes, Ronaldo gathering Paulo Dybala's pass, cutting inside and firing right-footed through the grasp of Emil Audero.

Juve seemed to relax after going ahead, though, and Samp levelled after 32 minutes through Quagliarella's spot-kick after a VAR review led to Emre Can being penalised for the ball striking his elbow.

Audero denied Ronaldo with a flying save as Juve stepped up the pressure after the break, but he could do nothing to stop the Portugal star from burying a penalty past him 65 minutes in, after Alex Ferrari was deemed to have handled in the box.

Saponara thought he had struck a sublime equaliser in injury time after a mistake by Mattia Perin, but a VAR check showed he was offside in the build-up, sparing the Juve keeper's blushes.

What does it mean? Juve ends 2018 in ominous form

Unbeaten after 19 matches and with a new Serie A record of 53 points at this stage of the season, Juve is looking almost unstoppable heading into the mid-season break.

Even if Napoli beats Bologna later on Saturday, it will be nine points behind the champion when league duties resume next month.

Sampdoria, meanwhile, could be five points adrift of the top four if Lazio defeats Torino.

Ronaldo rescues Juve again

Fresh from his crucial cameo against Atalanta, Ronaldo took his tally for the season to 14 strikes in Serie A, and ensured Juve broke the 100-goal mark for the calendar year. A little more than a month away from his 34th birthday, he looks as decisive as ever.

What's next?

Coppa Italia matches mark the return from the break, with Juve heading to Bologna and Samp hosting AC Milan on January 12.