Glamorgan fell to a 58 run defeat against Durham in their LV= County Championship encounter at Riverside.
Chasing a total of 191, the Welsh county were bowled out for 137 with the impressive seamer Matt Potts picking up a seven-wicket haul.
After six matches in the four-day competition, Glamorgan have two wins, two losses and two draws.
"I thought Durham bowled brilliantly," said Head coach Matt Maynard.
"The wicket was a little bit up and down, but Matthew Potts and Brydon Carse alongside Ben Raine and Chris Rushworth gave us nothing. I think there was one four-ball in the entire session.
"They bowled a good length and made life very tough for us. We said we were very comfortable chasing the target, and we said let's play as busy as we have been.
"They set the fields very well and changed the bowlers to keep them as fresh as possible. They didn't miss the target. Full credit to the way Durham went about it.
"I think they got a couple of decisions that went their way and we've paid the consequence for that. The five-penalty run offences were Billy Root as he didn't believe he got anywhere near the ball and lifted his head and arms up.
"Michael Neser then clearly felt he hit the ball and raised his bat a little bit. We have to be careful in the game that we don't confuse human emotion with reactions to a decision that has gone against you. But the rules are the rules, and we have broken them in both cases."