Angler Trey Siner of Concord, N.C. reeled in a 423.8-pounder to give his team the early lead during day one of the Big Rock Blue Marlin Tournament in Morehead City.
Siner and Sensation captain Dale Britt battled their fish for nearly two hours after it ran deep below the boat.
Sensation is entered in all levels and is currently in line to win $494,710 from the $1,154,625 purse. All but two of the 100 boats in the field went offshore Monday, a day that has been big in recent Big Rock history.
This year's Fabulous Fisherman's Level VI is worth $255,250 for the first boat to weigh in a 500-pound (or larger) blue marlin.
The Goin Deep took the lead in the dolphin division with a 48.8-pounder. Sea Hag weighed in a 45.2-pounder to take the runner-up spot in the dolphin category.
Water's Edge grabbed the lead of the waho division with a 56.8-pounder.
The Irish Ayes, captained by Brent Johnston of Wilmington, grabbed both places in the tuna category with a 59.5-pounder reeled in by Don Bartenfelder of Manchester, MD, and a 50.9-pounder landed by Tom Slezak of Middleriver, MD.
Competitors in the 55th Big Rock are allowed to fish four of the six fishing days.