Bury boss Alan Knill lamented both his side's slow start and missed chances as they failed to build on two impressive away league wins with a 2-1 FA Cup defeat to Peterborough.
The visitors took the lead through a 13th-minute strike by Lee Tomlin before Craig Mackail-Smith doubled their advantage in the 38th minute. Ryan Lowe pulled one back in the 51st minute for Bury, but Posh held on to avoid a replay.
"They scored an early goal, which makes it difficult," he said. "We got back into the game and had chances and had we gone in at 1-0 then second half we'd have a real good chance, but we gifted them a second goal.
"It doesn't matter who you're playing, you can't give them a 2-0 lead, especially if it's one of the top teams in the division above.
"But I thought we were excellent second half, created lots of chances and their keeper's made a couple of great saves.
"We wanted to see if we could compete against a top team and I think we did - the difference is they took their chances and we didn't."