Andy Robinson scored inside two minutes as Tranmere Rovers moved into the second round of the Capital One Cup with a routine win over Mansfield Town.
Robinson netted with a glancing header following Ryan Lowe's clever flick on.
And Chris Atkinson made it 2-0 to the League One side when he exchanged passes with Lowe and fired the ball into the top corner from a tight angle.
The Stags improved after the break and James Jennings and Louis Briscoe both went close, but the hosts held on.
VIEW FROM THE DRESSING ROOM
Mansfield Town manager Paul Cox told BBC Radio Nottingham:
"We can't keep giving teams 2-0 leads and expect to win.
"In the past two seasons our success has been been built around hard work, desire and hunger and all those kind of words. I thought that was lacking in the first half.
"In the second half we gave ourselves a chance but the balls don't seem to be dropping for us in the right areas.
"But we have to make things happen to win football matches. I am not one for sitting around feeling sorry for myself."