British light-heavyweight Joshua Buatsi made a winning yet unimpressive start to his career under recent management with a decision win over Parker in the Manchester arena.
The Olympic bronze medallist's work rate seemingly secured him a split decision in a close ten-round fight at the Co-op Live Arena.
But Parker landed significant shots, delivering effective single shots in a contest where the styles didn't complement each other, with excessive holding marring the contest.
The officials had it 96-94 to Buatsi, with the final judge a even score.
"It wasn't my finest performance but what defines champions? They succeed," the victor commented in the ringside as he was met by negative reactions from the spectators.
The British fighter bounced back after his initial pro loss - an memorable fight with his previous opponent in last winter - to earn a twentieth professional win.
Some ringside observers thought Parker, thirty-one, should have been awarded the decision but the Derbyshire fighter endured the second loss of his 28-bout professional journey.
Buatsi Secures Victory in Uneventful Match
His career development has stalled in recent years through promotional disputes and considerable time of inactivity.
Previously predicted as the rising talent of the British fight scene, he now stands trying to achieve expectations - possibly in what appears to be a final roll of the dice - under recent support.
He opened tentatively, with the two boxers prepared to be aggressive in a calculated early stages.
Parker, whose sole prior loss came at super-middleweight against John Ryder in two years ago after suffering a hand injury during the bout, was participating in his second appearance at light heavyweight.
By the fight's midpoint, Parker had made it competitive, creating difficulties for the favorite, who utilized a protective stance to narrowly win the cleaner stanzas.
The audience's tolerance decreased during frequent holding, with the challenger slipping to the canvas multiple occasions during grappling.
Parker ended stronger, but several stanzas were difficult to score. Although, ex-champion the boxing analyst - providing analysis for the broadcast network - had it strongly leaning for Parker, giving Buatsi just one round.
The victor moves on, but with the caliber of hard hitter Benavidez, and Russian star Dmitry Bivol leading the category, the road to world glory - based on this performance - still appears challenging.
Hatton Tribute Fuels All-Manchester Contest
In the secondary fight, Lyndon Arthur overcame Bradley Rea by close verdict in a outstanding Manchester vs Manchester fight to secure the European light heavyweight belt.
The arena fell silent for a extremely emotional memorial ahead of the contest as 10 bells sounded in remembrance of local hero Hatton, who succumbed aged 46 in recently.
It was the premier televised fight night in the location since the passing of Hatton. As the final chime ended, the silence gave way to a shout of "there's just one Ricky Hatton".
The competition during the bout reflected the emotion. Arthur was knocked down by a powerful punch directly to the chin in the initial stage, rising shakily to his feet on the count of eight.
But the traditional red equipment of Arthur soon came forward again. From the other corner, Rea - in competitive blue - was injured early, heavy swelling developing under his face as the duo traded hard punches.
The challenger, 27, connected with strong blows but the champion, 34, fought fire with fire with effective uppercuts as the intensity seldom decreased over twelve rounds.
The victor edged the verdict with judges scorecards of even score, close margin and wider gap, but both fighters were determined and courageous, all the qualities their inspiration Hatton embodied.
