Mansfield Town 1 Carlisle United 0: Tyler Walker's second-half penalty saw Carlisle United suffer their second defeat of the League Two campaign.

The Mansfield frontman sent keeper Adam Collin the wrong way from the spot in the 55th minute at the One Call Stadium.

It came after ref Darren Drysdale ruled that CJ Hamilton had been fouled as Jerry Yates and Jamie Devitt challenged him just inside the box.

United disputed the decision but the Stags went ahead.

The hosts could easily have won by a bigger margin, spurning a host of chances.

Gary Liddle cleared a header off the line and Adam Collin saved at Hamilton's feet in the first half.

After the break, Collin again denied Rose and, after the goal, Otis Khan hit the post, sub Craig Davies also wasting some good openings.

United, including debutant sub Jack Sowerby, almost snatched an unlikely point at the death but keeper Bobby Olejnik tipped over Jerry Yates' header.

Liddle and Collin came to the rescue to keep Carlisle level at the break.

On 22 minutes Liddle was in the right place to make a goalline clearance when Danny Rose had a free header at a Stags corner.

Then moments before the break, Hamilton was sent clean through by team-mate Khan, but Collin, on his first start of the season, took the sting out of the shot and Liddle was able to clear.

Matt Preston also missed a good headed chance with the last touch of the half for the hosts.

Those chances came as David Flitcroft's side had the better of the first 45 minutes without finding a way through.

Collin also saved an early Khan attempt and the latter was denied ambitious penalty appeals against Yates.

Alex MacDonald sliced wide from the edge of the box and later Ryan Sweeney failed to reach a MacDonald cross, before an Anthony Gerrard interception denied MacDonald.

At the other end, United found some useful positions but couldn't find a decisive touch.

Hallam Hope was denied a penalty when challenged by Sweeney, while Jamie Devitt failed to pick out team-mates from good crossing positions.

Collin, Macaulay Gillesphey and George Glendon had come into the United side while new signings Sowerby and Luke O'Reilly were on the bench.

With Joe Fryer and Danny Grainger out injured, boss John Sheridan also made a tactical change, with Yates and Gillesphey operating as wing-backs, and Hope up front with Richie Bennett, Ashley Nadesan dropped to the bench.

Mansfield started the second half well with Rose shooting wide and then denied by Collin, before the penalty breakthrough opened the scoring.

In response, Hope appealed unsuccessfully for handball when failing to connect with a Devitt cross.

Home sub Davies then had a great chance to make it two but delayed his shot, then failing to finish two further chances as the ball broke.

Blues sub Adam Campbell had a shot blocked before Khan and Davies combined before Khan hit the post, Walker firing the rebound over the bar.

Collin saved a Ryan Sweeney header before Anthony Gerrard's 90th minute cross picked out Yates at the far post, Olejnik saving from the loanee.

That was enough to seal United's first league defeat since the opening day as they slipped to 10th in the table, in front of a 4,470 crowd including 373 travelling fans.

Mansfield: Olejnik, Preston, Pearce, Sweeney, White, MacDonald, Bishop, Hamilton, Khan (Butcher 90), Rose (Davies 62), Walker. Subs: Logan, Gibbens, Benning, Atkinson, Mellis.

United: Collin, Liddle, Gillesphey, Gerrard, Parkes, Etuhu, Glendon (Nadesan 59), Devitt (Sowerby 59), Hope, Yates, Bennett (Campbell 69). Subs: O'Reilly, Miller, Slater, Adewusi.