If not for Hayne, Parramatta would not have been in the contest - with him, they were a chance to secure just their second win of the season until the final play of the game.
Mooted as the potential NSW five-eighth, a jersey Carney also covets, Hayne continued to excel in his hybrid role at the Eels.
After just five minutes, the 24-year-old took the ball at second receiver off a scrum and forced his way over the tryline.
He then marshalled a comeback before halftime after the Eels had fallen behind 18-6, with tries to Ben Pomeroy, Matthew Wright and Jason Bukuya giving the Sharks the advantage.
Perhaps his finest moment came in the 33rd minute, when he popped an incredible flick pass to Esi Tonga, who put Blair over in the corner for Chris Sandow to convert.
Then, with just 60 seconds before the break, Hayne reprised his fullback role, leaping high to grab a Sandow cross kick to touch down next to the posts and level the scores.
Unfortunately for Hayne, he didn't have an answer to the rock solid Cronulla defensive line, which held firm under immense pressure in the final 15 minutes as they clung onto a well-earned win.
Sandow left the field with 10 minutes to play with an arm injury, sustained 20 minutes earlier when he tried to put a big hit on Sharks fullback Matthew Wright.
-AAP