The Cronulla Sharks clinched the Grand Final double after defeating the South Sydney Rabbitohs to claim both the 2015 SG Ball and Harold Matthews Premierships.

The Sharks completed the fairy-tale run from eighth-position with a 24-16 victory at Leichhardt Oval.

It was a nervous finish for Cronulla who led 24-6 before South Sydney cut the deficit to 24-16 with 10 minutes remaining.

Sharks prop Daniel Vasquez was magnificent in receiving man-of-the-match honours. 

Cronulla Sharks 24 (W Kennedy, J Tuilagi, C Scott, K Yorston, B Magoulias tries; J Williams 2 goals) bt South Sydney 16 (B Perry, C Murray, S Talakai tries; Siosifa Talakai 2 goals)