The 33-year-old has returned to the Super League from Wests Tigers in the NRL and repaid the faith shown in him by new coach John Cartwright, the former Brisbane Broncos assistant mentor, with a dynamic display to down the Dragons.
Arthur Mourgue returned to his more regular fullback position after Sam Tomkins was ruled out by a hamstring injury, with fellow France international Cesar Rouge teaming up with NRL star recruit Luke Keary in the halves.
Hull were able to give Sezer his first start for the club but he conceded the first penalty of the game with a high tackle on Rouge and Catalans forced their way over the line only for captain Benjamin Garcia to be held up.
Prop Romain Navarette failed a head injury assessment, leaving Catalans low on forward power from the 20th minute and it was evident as they laid siege to the Hull line but could not muscle through.
Then two touches of magic from Sezer with the boot, first forcing Tommy Makinson into a knock-on from a high ball then kicking directly to Mourgue, saw the ball knocked back into the hands of Jordan Lane for the first try of the game. Sezer converted for a 6-0 lead.
Catalans pummelled the Hull line and winger Tommy Makinson thought he had scored in the right corner but the video referee spotted a knock-on before he grounded the ball.
Hull then switched the momentum once more with a terrific burst from fullback and former Canberra Raider Jordan Rapana, supported by Cade Cust who crossed the line unhindered, with Sezer adding the conversion for 12-0 just before half-time.
FC scored a killer try on the stroke of the interval when Sezer picked up a rebound from the Dragons and fed Tom Briscoe, who raced 30 metres to score as the hooter beckoned. Sezer once again made the conversion for a well-deserved 18-0 lead.
A half-time roasting from Catalans coach Steve McNamara fired up ex-NRL star and second-rower Tariq Sims, who appeared to make late contact on Sezer although referee Chris Kendall sent him from the pitch for a green card assessment.
Mourgue hit back for Les Dracs with a sprint to score in the right corner four minutes into the second half, but he was unable to convert his own try.
Makinson again went close for the Dragons but was unable to control the finish, with Cust then scoring the killer blow with an interception from a Keary pass and 40-metre race to the right corner to score, although Sezer was off target from the touchline as the score moved to 22-4.
Sezer then converted a penalty goal five minutes from time to give Cartright the perfect start.
In the other match on Friday, last year's grand finalists Hull KR scored a golden-point victory over the Castleford, winning 19-18.
Joe Burgess, who played for the Sydney Roosters and South Sydney before returning to the Super League, scored three tries while Mikey Lewis nailed the winning drop goal.
