Duberry thought he was heading the ball back to Brown; instead he nodded it firmly past him and Nahki Wells turned on the turbo to divert it into the gaping net from an acute angle.
It was only thanks to Duke that City got within touching distance of grinding out a point. He pulled off important saves from Sean Rigg and Lewis Montrose and an absolute belter just before half time at his near post to deny a disbelieving Potter.
only Coventry standing between the winners and the national stadium.
City's other new face, left back Ryan Dickson, had another uncomfortable debut. The Southampton man seemed to be trying a bit too hard to impress but , just like Gray, will clearly make an impact as he settles in.
Before then there is the obligatory midweeker with the JPT northern area semi final at Crewe. Another route, possibly more realistic, to Wembley beckons, with Nike Air Max 90 Purple And White
It was hard to tell from the TV angle but looked more of a penalty than the blatant dive which earned the one that beat Villa at the weekend.
The winner came in contentious circumstances with City sure that Stephen Darby had got a toe on the ball before Potter went tumbling.
There was no more joy for Will Atkinson or the second half replacements Kyel Reid and Blair Turgott. Not once did any of them manage to isolate a defender one on one around the Oxford penalty area.
As City disputed the victory clinching penalty, Oxford could point to those chances, the one off the line and a point blank Rigg Nike Air Max 90 Womens Pink White header that came down off the underside of the bar.
Zavon Hines had to make more tackles in an hour than he'd probably expect all season. He stuck at it doggedly but you don't want to see a potential match winner having to track back into his own half all the time, especially at home.
Yet City had still struck the first blow after a comical miscommunication between Duberry and Oxford keeper Wayne Brown.
The widemen constantly found themselves pushed back by the blue shirted wingbacks Damien Batt and Liam Davis.
keeper Matt Duke. Having defied pretty much everything that Villa threw at him, Duke was just as commanding and confident against League Two's form team.
The notable exceptions were at the back, not surprising considering that Oxford out shot their hosts ten to two with efforts on target.
Carl McHugh has had a remarkable time since his first appearance as a raw trialist in his native Ireland last summer. The maturity and composure in his play is incredible for a lad who has only just passed double figure in first team starts.
City are not the only member of the pacesetting bunch to suffer an attack of the collywobbles. Southend and Fleetwood, who share 40 points with them, have also come off the tracks in the last couple of weeks.
Andy Gray's arrival remedied that and he was thrown straight in for his second coming as a Bantam. Unfortunately, nobody told his team mates, who proceeded to deliver the usual aerial diet of passes that Hanson feeds off.
Nobody would dispute Chris Wilder's claim that the visitors had dominated the second half, even if it took until the 89th minute to make the breakthrough.
Aston Villa and rest limbs wearied by the punishing programme.
Oxford's win was their fourth straight hauling in an 11 point deficit on the Bantams during that time. They have a game in hand to ease past, as do Northampton.
So while the focus remains on catching those in front, all of a sudden there are a stampede of mid table clubs snapping at the heels.
But Oxford were level within a few minutes thanks to a stunning strike from Rigg. Potter's cross was half cleared by Dickson and the former Port Vale man met it with a sweet left foot from the edge of the box.
But once again the star performer in the City ranks was Nike Air Max 90 White And Black Grey
His 17th goal of the season did come at a cost as he clattered into an advertising board and cut open his knee which could well spare him Johnstone's Paint duties.
The bobbly pitch did not make for the free flowing football that had carved open Villa but City also never got to grips with Oxford's 3 4 3 set up.
But given the wintry conditions kicking in, it would not be a bad thing if the Gresty Road clash was iced off. A chance to clear heads still clouded by Nike Air Max 90 Floral White
Peter Leven, a one time City trialist and Peter Jackson target, left no doubt about the spot kick. Deep down there was no doubt that the right team had won either.
He has not been fazed by any Premier League opponent and there was no hint of any comedown from the frenzy of scoring the third goal against Villa. He delivered another rock solid display at the heart of the defence, topping it all off with an acrobatic clearance off the line to thwart Alfie Potter's header.
Gray is a different type of targetman and while he demonstrated some neat hold up play on occasions, he could not replicate Hanson's power at dominating centre halves. The hopeful punts upfield proved meat and drink for Michael Duberry and one time Bingley Grammar School pupil Jake Wright.
Phil Parkinson, whose own future is now top of the agenda after the Blackpool interest was confirmed, gave James Hanson a much needed breather on Saturday. The big man has been playing through a toe injury because there was simply nobody to take his place.
Referee Jeremy Simpson, chalk and cheese compared with Howard Webb, was sure. Given his poor performance in the previous 89 minutes, nobody in claret and amber was remotely convinced.
In fact, it was an afternoon which few will look back on with any fondness. After the Lord Mayor's show of Tuesday night, Saturday's performance left the crowd as cold as the bitter easterly wind.
Cup heroes' league form takes worrying nosedive From Bradford Telegraph and Argus
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