The Blades twice went close early on but John Brayford cleared a Neil Collins header off the line and Michael Doyle's header flew over.
David Wheater cleared a Manucho header off the line before Marlon King slotted in to secure Boro's win.
Elyaniv Barda equalised eight minutes later with a close-range finish before Damien Johnson cleared Tamir Cohen's header off the line.
Coates scored the winner from a Martin Donnelly cross while, at the other end, Keenan saved Andy Smith's header on the line.
Jones missed a cross and needed Wheater to clear Manucho's header off the line, which did nothing for the home side's nerves.
After Nathanial Clyne cleared Posh midfielder Chris Whelpdale's header off the line, Butterfield flicked on for Neil Danns to hook acrobatically home.
Crouch was denied a second when his acrobatic volley was well saved, before Bardsley cleared his header off the line from Gerrard's corner.
BBC: Crouch's goal was only his second in the league this season
Dunn's continued presence on the pitch took on greater significance seconds before the break when he cleared Phil Jagielka's header off the line.
Johnson came to N Ireland's rescue from a 36th minute corner, the midfielder stationed at the backpost to clear Cohen's header off the line.
Brayford did superbly to nod Collins' goal-bound header off the line and Doyle headed over from six yards following Bjorn Helge Riise's 18th-minute corner.
City had the chance to extend their advantage inside the opening two minutes, but Mark Hudson managed to clear Marvin Elliott's header off the line.
Sionko almost had a second goal in the 29th minute when goalkeeper Ricardo flapped at another corner, but Joao Moutinho cleared his header off the line.
Watford were understandably demoralised, but Henderson almost got his second of the night after 81 minutes, only for Bryan Hughes to clear his header off the line.
He distinguished himself in defence by clearing Porto substitute Cristian Rodriguez's header off the line, then unveiled a moment of supreme skill to wrap up Arsenal's win after 63 minutes.
Eardley cleared a Kyrgiakos header off the line at the other end but Liverpool were shocked as the visitors took the lead when Adam drove in a penalty after Johnson tripped Varney.
Dempsey and Konchesky forced Duke to tip over goalbound strikes before Mendy showed the value of a defender on the post at a corner by clearing a Johnson header off the line.
Tottenham were not as fluid after the break, and Boro came close to equalising in the 47th minute only for the ubiquitous Lennon to clear David Wheater's goal-bound header off the line.
The first real moment of threat to Cardiff came after 28 minutes as Fryatt forced goalkeeper Tom Heaton to tip his effort around a post with Bothroyd called on to clear Gerrard's goal-bound header off the line from the resulting corner.
Wales captain James Collins had a header cleared off the line while Rob Earnshaw saw a close-range shot saved.
First, Carlos Cuellar had a header cleared off the line then Ferguson's snap-shot from 12 yards was saved by Boruc.
Gerrard then drew two fine saves from Friedel, while substitute Crouch had a header cleared off the line by Bentley.
In the last action of the opening 45 minutes, Cardiff centre-back Dekel Keinan had a header blocked on the line by Corry Evans.
Crusaders refused to lie down and Martin Donnelly saw his flick header cleared off the line before Owens reduced the Seaview men's deficit.
West Brom came back strongly and Ryan Donk had a header cleared off the line before James Morrison saw his shot well saved by Myhill.
Andrea Pirlo cleared a David Weir header off the Italian line.
Nemanja Vidic had a header cleared off the line and Brad Friedel superbly denied Dimitar Berbatov as Villa clung on to claim an historic win.
Yet there were promising early signs from the hosts, with Manuel da Costa seeing a towering header cleared off the line by Morten Gamst Pedersen.
Andy Johnson had a header cleared off the line for Fulham, while Hull keeper Matt Duke saved from long range Paul Konchesky and Clint Dempsey strikes.
At the other end Doyle saw a header clawed off the line by Schwarzer and Sylvan Ebanks-Blake rifled into the side-netting in a richly entertaining second half.
The visitors went in search of a leveller early in the second half and Iriekpen had a header cleared off the line after Luis Rubiales' corner had struck the crossbar.
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