UK light heavyweight Joshua Buatsi made a winning yet underwhelming beginning to life under recent management with a decision win over Parker in the Manchester arena.
The Olympic bronze medallist's punch output seemingly secured him a split decision in a close ten-round fight at the Manchester venue.
But the challenger landed significant shots, connecting with powerful clean blows in a match where the techniques failed to mesh, with constant grabbing spoiling the action.
The scoring judges scored it 96-94 for to the winner, with the remaining official a even score.
"It wasn't my finest performance but what defines champions? They win," Buatsi stated in the ring as he was faced negative reactions from the audience.
The British fighter got back to winning after his first professional defeat - an epic battle with his previous opponent in last winter - to claim a 20th pro success.
Some ringside observers believed Parker, 31, deserved the decision but the British boxer endured the second loss of his 28-bout career.
The Champion Claims Win in Dull Affair
His career development has plateaued in recent years through management issues and considerable time of lack of fights.
Earlier forecast as the rising talent of UK boxing, he now stands trying to realize his potential - maybe in what appears to be a ultimate opportunity - under recent support.
He opened tentatively, with the two boxers ready to be aggressive in a tentative initial rounds.
Parker, whose single earlier setback came at super middleweight against John Ryder in two years ago after suffering a hand injury mid-fight, was competing in only his second appearance at the higher weight class.
By the halfway stage, the underdog had kept it close, making life awkward for Buatsi, who operated with a tight guard to barely take the better stanzas.
The spectators' acceptance decreased during regular grabbing, with the challenger falling to the floor several times during clinches.
The underdog ended stronger, but many rounds were challenging to assess. However, ex-champion Carl Frampton - working with the broadcast network - had it particularly wide for Parker, giving Buatsi just only one stanza.
Buatsi progresses, but with the caliber of power puncher David Benavidez, and Russian champion Dmitry Bivol ruling the division, the road to world glory - on this evidence - still seems difficult.
Hatton Homage Fuels Manchester Derby Fight
In the supporting bout, Lyndon Arthur defeated Bradley Rea by split-decision in a excellent Manchester vs Manchester contest to win the continental championship.
The venue became quiet for a extremely emotional tribute prior to the bout as 10 bells tolled in remembrance of the city's native Hatton, who succumbed 46 years old in last month.
It was the first major televised match card in the city since Hatton's passing. As the concluding sound ended, the silence transitioned to a chant of "there's only one Ricky Hatton".
The competition during the bout equaled the feeling. Arthur was floored by a left hook flush on the face in the second round, getting up unsteadily to his position on the count of eight.
But the Manchester United-red equipment of Arthur soon came forward again. On the opposite side, the opponent - in rival City blue - was damaged soon, noticeable damage forming under his eye as the fighters traded punishing blows.
Rea, twenty-seven, connected with strong blows but Arthur, 34, fought fire with fire with powerful upward punches as the action hardly diminished over twelve rounds.
Arthur barely secured the result with judges scorecards of draw, close margin and wider gap, but the two athletes were relentless and brave, all the qualities their idol the legend stood for.
