Despite narrowly missing out on an 11th consecutive finals appearance, anything less than a top eight finish was always going to be below par for Manly.
Manly back-rower Justin Horo signed off from the club and the NRL in style, pulling off a remarkable play to set up the Sea Eagles' match-winning try.
Sea Eagles held strong with limited possession to come out winners and send out coach Geoff Toovey a winner, while Sharks will look to bounce back in finals.
Manly have upset the finals-bound Sharks 14-12 in a thriller, denying Cronulla a place in the top four on the NRL Telstra Premiership ladder.
A deft Johnathan Thurston pass, an acrobatic Jamie Lyon kick, some Benji Marshall magic, James Tedesco speed and Jared Waerea-Hargreaves strength.
The Sharks are looking to cement a place in the top 4, while the Sea Eagles will need a miracle to make their 11th consecutive finals appearance.
Manly players know Sunday's game against Cronulla is almost certainly their last of the season but won't concede their dim finals hopes without a fight.
Willie Mason, Charlie Gubb, Issac Luke and Alex Glenn have all received suspensions from the weekend's matches, while Korbin Sims was cleared at the judiciary.
Manly centre Steve Matai has played 220 first grade games so far in a career spanning 11 seasons and has never missed a finals series.
The race for top spot heats up, Manly's slim chances of making the finals, hat-tricks galore and a scorned skipper reminds everyone what he's capable of.