Ched Evans went close with a header and Daniel Sturridge's shot hit the bar.
Footballer Ched Evans has lost the right to appeal against his conviction for rape.
Ched Evans and Nick Montgomery then spurned chances to add to the lead as the visitors dominated possession.
Wales footballer Ched Evans was jailed for five years in April 2012 for raping a 19-year old woman.
But the win was sealed 10 minutes from time when the visitors' Mario Frick deflected in Ched Evans' header.
United manager Kevin Blackwell brought on strikers Richard Cresswell and Ched Evans but they were unable to make significant impact.
Felipe Caicedo, Valeri Bojinov, Benjani Mwaruwari and Ched Evans have also been given shirt numbers ahead of the new season.
Mark Sweetman took the photo at Prestatyn when nine people admitted naming footballer Ched Evans's rape victim on Twitter and Facebook.
BBC: Ched Evans Twitter case: Mark Sweetman fined over photo
He was picked out on the edge of the box by Ched Evans but his shot was deflected out for a corner.
He will be joined by Ched Evans, Sam Vokes, Andy King and Joe Allen, who all featured in the win over Scotland.
The warning comes after 17 arrests after the alleged Twitter naming of the victim in Wales and Sheffield United footballer Ched Evans' rape case.
Wales and Sheffield United striker Ched Evans has rejected claims he raped a woman at a hotel, telling a jury she consented to sex.
North Wales Police have charged two people in connection with the naming on Twitter of a woman who was raped by Wales footballer Ched Evans.
BBC: Ched Evans rape case: Two charged in Twitter investigation
Five more people have been charged in connection with the naming on social media of a woman who was raped by Wales footballer Ched Evans.
Blades leading scorer Ched Evans should have equalised but he shot over from 12 yards and then fired a 43rd-minute effort straight at goalkeeper Frank Fielding.
Jones is tracking 22 potential transfer targets and has been linked with Manchester City's young Wales striker Ched Evans and Republic of Ireland midfielder Liam Miller.
Ched Evans took over up front for the hard-working Vokes after 62 minutes, while defender Lewin Nyatanga was sacrificed as David Cotterill beefed up Wales' attacking options.
"An article in The Sun today, that Sheffield United has offered a contract to former player Ched Evans is false and damaging to the club, " read a statement on its official website.
Good work by Bellamy's Manchester City team-mate Ched Evans down the right channel fashioned another chance for his skipper, only for Bellamy to sky the cross high over the bar.
With Jo, Benjani Mwaruwari and Valeri Bojinov also all missing, City could be forced to field teenagers Daniel Sturridge and Ched Evans in Saturday's Premier League opener against Aston Villa.
Harper should have doubled the home side's lead following a fine move, when Cresswell's cross found Ched Evans, whose unselfish layoff was volleyed over the bar by the former Reading midfielder.
That forced Hughes to bring on Ched Evans for Dietmar Hamman, and the young Welsh striker immediately forced Steven Taylor into a superb block to deflect a shot over the bar.
But from Bale's resulting corner, Vokes made himself a hero as he cracked home the loose ball after fellow teenager substitute Ched Evans had made a nuisance of himself in the box.
Captain Ashley Williams protected the back four with Edwards and Joe Ledley in central midfield while Ramsey did his damage from a free roaming role behind strikers Simon Church and Ched Evans.
North Wales Police have arrested a 51-year-old man from Essex as part of an investigation into the naming on Twitter of a young woman who was raped by Wales footballer Ched Evans.
Gunter is one of a host of promising youngsters in Toshack's squad along with West Ham United's midfielder Jack Collison, former flat-mate and Arsenal playmaker Aaron Ramsey, Manchester City striker Ched Evans and Spurs team-mate Gareth Bale.
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