Goals from Chris Beardsley and Mark Roberts saw 10-man Stevenage hold on for a victory against Tranmere.
Beardsley put the hosts ahead when he flicked in Lawrie Wilson's long throw but Stevenage then had Ben May sent off for a foul on goalkeeper Paul Rachubka.
But Stevenage, now unbeaten in 11 matches, doubled their lead as Roberts headed in Robin Shroot's free-kick.
Rovers' Joss Labadie converted a penalty after Scott Laird had fouled Mark McChrystal but it was not enough.
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Stevenage manager Graham Westley told BBC Three Counties Radio:
"I think my memory of the game is the penalty that has been given at the end. We have gone five games without conceding a goal and to have that given has left a very sour taste in my mouth.
"When stuff happens that isn't expected it is about solving problems and once again the players have solved the problem that is in front of them and they have managed to do what it takes to post the three points.
"He [Chris Beardsley] is a fantastic player to manage. He gives you 100% on the training ground every day and on a Saturday afternoon you know exactly what you are going to get from him. He is our top points per game player at the club."
Tranmere manager Les Parry told BBC Radio Merseyside:
"I think we can take a lot of positives out of that. I thought we were the better side in the first half by far.
"We caused them a lot of problems. We've got to take our chances but you're fed of hearing me say that and I'm fed up saying it.
"I was disappointed with both goals - set plays. It's not nice to concede from those especially the second one which was a free header, which is happening too much now.
"That's something we've definitely got to look at. Performance-wise, that was more like us away from home. We battled and we did well."