Despite Hayne's red-hot form and their exuberant start to the season, Parramatta have now slipped to consecutive losses and sit precariously in tenth place on the ladder.
Newcastle, on the other hand, have emerged as NRL giant killers, knocking off North Queensland last week and now Parramatta.
Radradra made things interesting at the death, with Newcastle ropeable the try was awarded after it appeared Parramatta forward Ken Edwards held back Knights defender Dane Gagai.
But video referee Steve Clark ruled the pair had hold of each other's jerseys and pressed the green light.
"So Dane held himself back? It was a professional foul," Knights captain Kurt Gidley remonstrated with referee Jared Maxwell.
But the Knights showed plenty of guts to hang on.
Boyd was slammed for his lacklustre performances early in the season as the Knights slumped to a nightmare run of seven straight losses, but since the State of Origin period the Queensland strike weapon has come into his own.
Hayne scored a scintillating 90-metre individual try in the eighth minute off a kick-return to put the Eels ahead 6-4.
But Boyd hit back with a special of his own before halftime, scooping up a kick and slicing through for a 95-metre runaway effort which spurred the visitors to a 16-6 advantage at the break.
Parramatta had their chances to get themselves back into the match, but execution let them down badly - with winger Vai Toutai and centre Ryan Morgan both dropping the ball in try-scoring positions and Chris Sandow's last-tackle options leaving plenty to be desired.
Boyd had his paws all over the Knights' opening try, with his long ball to centre Joseph Leilua resulting in Akuila Uate touching down for his seventh try in five games.
Leilua got himself on the scoreboard in the 30th minute when he Morgan spilt a bomb right on the Knights' goal-line.
-AAP
