UK light-heavyweight Buatsi secured a victory yet underwhelming debut to life under recent management with a points victory over Zach Parker in the Manchester arena.
The Olympic bronze medallist's activity level seemingly secured him a split decision in a close ten-round bout at the Co-op Live Arena.
But Parker had his moments, delivering effective individual punches in a match where the styles never quite clicked, with frequent clinching disrupting the fight.
The scoring judges judged it 96-94 for to Buatsi, with the third a 95-95.
"It wasn't my greatest performance but what do champions do? They succeed," Buatsi stated in the ring as he was met by disapproval from the crowd.
The Londoner returned to winning ways after his initial pro loss - an epic battle with his previous opponent in February - to secure a 20th pro success.
Several boxing experts thought Parker, 31, should have been awarded the win but the contender endured the second setback of his 28-match professional journey.
Buatsi's progress has slowed in recent years through promotional disputes and considerable time of inactivity.
Earlier forecast as the rising talent of British boxing, he now finds himself trying to realize his potential - possibly in what feels like a ultimate opportunity - under recent support.
He opened tentatively, with both competitors willing to be aggressive in a calculated early stages.
The challenger, whose sole prior loss came at super middleweight against his former opponent in two years ago after breaking his hand during the bout, was making just his second appearance at light heavyweight.
By the fight's midpoint, the underdog had kept it close, causing problems for the favorite, who utilized a solid defense to narrowly win the more effective periods.
The spectators' acceptance decreased because of regular grabbing, with the challenger going down various instances during close exchanges.
The underdog finished the stronger, but several stanzas were hard to judge. However, previous titleholder Carl Frampton - commentating on the broadcast network - had it strongly leaning for the challenger, scoring for Buatsi just one round.
The victor advances, but with the presence of heavy hitter David Benavidez, and Eastern European fighter Dmitry Bivol leading the category, the journey to titles - judging by this showing - still appears challenging.
In the co-main event, Arthur beat Rea by close verdict in a excellent all-Manchester fight to capture the continental belt.
The venue fell silent for a profoundly moving homage ahead of the contest as 10 bells sounded in honor of the city's native Hatton, who passed away at age 46 in September.
It was the first major televised match card in the location since Hatton's death. As the concluding sound ended, the silence gave way to a chant of "only one Hatton".
The action within the ring matched the sentiment. The eventual winner was knocked down by a significant blow flush on the face in the second round, rising shakily to his feet on the eight count.
But the red-colored attire of Arthur soon pressed ahead again. Across the ring, the opponent - in competitive blue - was injured early, noticeable damage appearing under his orbital area as the pair landed hard punches.
The challenger, 27, landed power punches but Arthur, thirty-four, fought fire with fire with powerful upward punches as the action rarely dropped over the full distance.
The victor edged the result with scoring tallies of draw, narrow lead and wider gap, but the two athletes were persistent and courageous, exactly what their inspiration Hatton represented.
A seasoned sports analyst with over a decade of experience in betting markets and statistical modeling across European leagues.