Marlon Pack scored a 25-yard stunner as Cheltenham kept the pressure on Crawley Town at the top of the table with victory over Rotherham.
The midfielder scored the game's only goal in the 11th minute with a low drive from distance.
The Robins could have won by more and Jimmy Spencer headed wide and hit the outside of the bar.
The Millers offered little going forward but Brett Williams forced a late Scott Brown save with a header.
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Cheltenham Town boss Mark Yates told BBC Radio Gloucestershire:
"It wasn't pretty, but we've ground it out. We dealt with a lot of long balls up to their strikers who were excellent and caused us problems.
"Second half we defended a lot better than we did first half. You're not going to win games playing flowing football all the time.
"We could have got a second possibly at times, but that's a great win for us on a Friday and it'll be a little bit sweeter watching other teams try and do it in a busy period of football."
Rotherham United manager Andy Scott told BBC Radio Sheffield:
"The better side's lost, but we've not hit the target often enough.
"We've got to keep believing, they're a good side, but I think we've shown them how good we are as well.
"We've got to take the positives out of tonight and got to believe what we're doing is right."