Hatton relinquished his WBA welterweight title on Thursday, having given up the IBF light welterweight crown in April.
Britain's former light welterweight champion Ricky Hatton, who was ringside for the bout, said he expected Harrison to deliver a better performance.
His next contest is set for 6 January, when he will attempt to regain the IBF light welterweight belt from current holder Juan Urango.
Much of boxing's cream is to be found in the lower weight divisions, with the light welterweight ranks full to the brim with talent.
"Only time will tell whether I'm more suited to welterweight or light welterweight, but I'm more explosive in the gym and I feel quicker, " said Hatton.
Dubliner Paul Griffin out-pointed Bulgarian Wladimir Borov in a featherweight contest while US-based Irishman Oisin Fagan beat Jeff Thomas to win vacant Irish light welterweight title.
On the undercard of Maccarinelli's 21 July show in Cardiff, Gavin Rees challenges for Souleymane M'Baye's WBA light welterweight belt and Alex Arthur takes on Koba Gogoladze for the WBO interim super featherweight title.
And he may well move up to light welterweight, a tough division already populated by Britons Ricky Hatton and Junior Witter, as well as by world players Kostya Tszyu, Floyd Mayweather Jr, Miguel Cotto and Arturo Gatti.
Also featuring on the card is 2002 Commonwealth Games champion Jamie Arthur, Pontypool welterweight Tony Doherty, Mountain Ash light-heavyweight Nathan King, Abercynon welterweight Taz Jones and Rhondda Valley light-welterweight Barrie Jones, who makes his professional debut.
However, Hatfield welterweight Saunders and Birmingham light-welterweight Gavin also weighed in on the issue, with 19-year-old Saunders saying the ABA "weren't providing what we wanted".
He's the best 140lb fighter for a long, long time and he will beat everything at light-welterweight.
Hatton suffered a brutal second-round defeat in his IBO light-welterweight world title bout against Manny Pacquiao in May.
Elsewhere, American Kendall Holt retained his WBO light-welterweight title with a split decision over Demetrius Hopkins in Atlantic City.
Light-middleweight Hope, 27, has followed their trail, taking another young Welsh boxer - Swansea light-welterweight James Todd - along with him.
Hatton's last fight for Warren was on 6 April 2005 when he notched a career-defining win over IBF light-welterweight king Kostya Tszyu.
The Bolton-born fighter is currently preparing for the defence of his WBA light-welterweight title against IBF champion Zab Judah on 23 July.
The next evening in Washington, he'll defend his WBA and IBF light-welterweight world titles against Lamont Peterson in a marquee fight on HBO.
The WBA light-welterweight champion's first title defence will be his first Saturday night headline show but Rees admits he is still an unknown champion.
Prescott, who has a height and reach advantage and has fought at light-welterweight before, predicts he can add another quick win to his record.
Costello said Gavin was not able to step up to the heavier class because fellow British boxing team-mate Bradley Saunders had already qualified in the light-welterweight.
His next goal, he confirmed, was to fight in the European Championships in Liverpool in November, where he hopes to fight in the 64kg light-welterweight category.
After the show, which both School Reporters enjoyed, it was back into reporting mode as they tracked down world light-welterweight champion Amir Khan and world heptathlon champion Jessica Ennis for further interviews.
Since then, Haye's personal manager Adam Booth has met with Haye's American promoters Golden Boy - who put on Amir Khan's WBA light-welterweight defence over Marcos Maidana on Saturday - to discover what terms they are prepared to accept, and offer.
While he has campaigned most of his career at the super-featherweight limit, St Clair has moved up for big fights against the likes of the late Diego Corrales and former WBA light-welterweight king Vivian Harris, both of whom he took the distance.
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