On what was a cold, rain-sodden night at Remondis Stadium, the Sharks edged the defending premiers 18 points to 10, with hooker Michael Ennis playing a leading role in the side's win.
Ennis delivered in the form of his craft, in laying on two try assists - both from grubbers - to see his side score a valuable two competition points.
But in testing conditions, Ennis' work without the ball also stood firm.
Ennis completed 32 tackles - missing only 2 - as the Sharks went about hanging on against a fast-finishing Souths outfit.
Was the effort the best personal performance of 2015? Have your say in our fan poll below!
Michael Ennis v Souths (Round 7)
All Runs (Run Metres): 2 (24m)
Try Assists: 2