British light heavyweight Buatsi made a winning yet disappointing debut to life under recent management with a points victory over Zach Parker in the Manchester arena.
The Olympic medal winner's punch output seemingly secured him a split decision in a close 10-round bout at the Manchester venue.
But the challenger found success, landing some telling individual punches in a match where the styles never quite clicked, with constant grabbing marring the contest.
The scoring judges scored it 96-94 in favor to Buatsi, with the final judge a 95-95 draw.
"It wasn't my greatest showing but what do champions do? They succeed," the victor commented in the ring as he was met by disapproval from the spectators.
The British fighter bounced back after his first professional defeat - an epic battle with Callum Smith in last winter - to earn a twentieth professional win.
Various analysts thought the challenger, thirty-one, deserved the win but the Derbyshire fighter experienced the second setback of his 28-match career.
The fighter's advancement has slowed in recent years through promotional disputes and long spells of inactivity.
Earlier forecast as the next star of UK boxing, he now stands trying to achieve expectations - perhaps in what seems like a final roll of the dice - under recent support.
He began cautiously, with neither fighter prepared to overcommit in a calculated initial rounds.
The challenger, whose sole prior loss came at the lower weight class against John Ryder in two years ago after damaging his hand mid-fight, was participating in his second bout at light heavyweight.
By the middle rounds, the underdog had stayed in contention, creating difficulties for Buatsi, who utilized a solid defense to barely take the more effective periods.
The audience's tolerance diminished amid regular grabbing, with Parker slipping to the canvas various instances during grappling.
Parker finished the stronger, but many rounds were hard to judge. Although, ex-champion Carl Frampton - providing analysis for Dazn - had it strongly leaning for Parker, scoring for Buatsi just one round.
Buatsi moves on, but with the likes of power puncher Benavidez, and Eastern European fighter Dmitry Bivol dominating the weight class, the journey to titles - based on this performance - still looks steep.
In the secondary fight, Lyndon Arthur overcame Bradley Rea by divided decision in a excellent Manchester vs Manchester battle to win the continental title.
The stadium grew hushed for a profoundly moving tribute before the fight as a bell ceremony rang in honor of Manchester's own Hatton, who died 46 years old in September.
It was the first major televised match card in the location since Hatton's death. As the last bell disappeared, the stillness became a shout of "there's only one Hatton".
The action within the ring equaled the sentiment. The eventual winner was sent to the canvas by a left hook squarely on the jaw in the initial stage, rising shakily to his feet on the referee's count.
But the red-colored shorts of the fighter soon pressed ahead again. Across the ring, Rea - in rival City blue - was marked up early, significant bruising forming under his orbital area as the duo traded powerful shots.
The challenger, 27, landed power punches but Arthur, thirty-four, fought fire with fire with stinging uppercuts as the action rarely dropped over the full distance.
The victor narrowly won the decision with official scores of even score, close margin and 115-112, but both fighters were determined and full of heart, exactly what their inspiration Hatton represented.