Sulęcki made his professional debut in June 2010, defeating Adam Gawlik by knockout in the first round in
Kielce, Poland. In June 2012, Sulęcki defeated former
welterweight world champion
Yuriy Nuzhnenko with a
unanimous decision. Over the next three years Sulęcki put together 15 straight victories before fighting for his first title in November 2013, against Lukasz Wawrzyczek for the vacant Republic of Poland
middleweight title. Sulęcki won by unanimous decision. In May 2014, he added the Polish International
super-middleweight title to that by beating Nicolas Dion of France over ten rounds. Sulęcki then faced former
European champion and
WBA middleweight world title challenger
Grzegorz Proksa at the
Krakow Arena, Poland in November 2014. Sulęcki was victorious in the all-Polish affair, stopping Proksa in the seventh round. Proksa's unorthodox style gave Sulęcki some trouble early on but as the fight went on, Sulęcki started landing more effective shots and ended the fight with a right-hand
counterpunch. Following that victory, the Pole teamed up with promoter
Lou DiBella and manager
Al Haymon and made his US debut against
Darryl Cunningham at the UIC Pavilion, Chicago in April 2015. Sulęcki again won by knockout, this time in the third round. Sulęcki then stopped 40-year-old Jose Miguel Berrio, late replacement for Eduardo Tercero, at the
Prudential Center. Sulęcki landed a number left hooks under the right elbow of Rodriguez and the referee stopped the fight before the end of the first round. Following this victory Sulecki was added as a contender for
Sherdog's Top 10 middleweights list. In 2016, Sulęcki defeated previously unbeaten prospect
Hugo Centeno Jr. with a knockout in the final round of a ten-round bout. This was Sulęcki's fifth consecutive knockout after only scoring three stoppages in his first eighteen fights. Sulęcki moved down to
light-middleweight in 2017. In October, he fought
Jack Culcay, backing up the
World Boxing Super Series quarter-final match between
Krzysztof Włodarczyk and
Murat Gassiev. Sulęcki beat Culcay with a unanimous decision (98-92, 97-93, 96-94). After that, Sulecki fought former world middleweight champion
Daniel Jacobs, who was ranked #2 by the WBA and WBO and #3 by the WBC and IBF at the time. He went on to lose the bout by unanimous decision. In his next fight in the States, Sulecki defeated Puerto Rican veteran
Gabriel Rosado in a grudgematch. This win eventually led him to a #2 ranking by the WBO and a mandatory world-title fight against
Demetrius Andrade. Andrade would end up being too much for the Pole, taking away every round from him, while also dropping him to the canvas in the process. Sulecki faced
Diego Pacheco in Carson, CA on August 31, 2024. This fight was for both the WBC USA and WBO International
super middleweight titles Sulecki lost the fight via KO after a left body hook knocked him down in the sixth round ==Professional boxing record==