Watch: Mertens' stunning free-kick doubles Napoli's lead

Dries Mertens reached the 20-goal mark in style after scoring a brilliant free-kick to give Napoli a 2-0 edge over Empoli on Sunday.

The Belgium international, who could have reached the mark earlier in the match had he not missed a penalty, moved into a three-way tie with Eden Dzeko of Roma and Mauro Icardi of Inter Milan in the scoring chart when his 30-yard strike curled into the top corner of goal.

Mertens has now scored 19 of his 25 goals in all competitions this season over his last 17 matches.