Arsenal manager Arsene Wenger says the Gunners enjoyed a positive game against Hull City on Sunday.
In a repeat of last season's final, Arsenal were almost always in control of the game as they reach the fourth round of the competition.
"I believe we had a serious performance," Wenger said.
"We were in control and it was a positive game. We created many chances and it took us a while until the 82nd minute to get the second goal but overall I think we had a serious, positive and good collective performance.
"From now on until May, it's more important to get the strong defensive stability. I'm not worried too much about scoring goals because we always look like we can create something at any moment.
"Of course, it's a bit cyclical sometimes. You create three chances, you score three goals, whereas sometimes you create six and you score once. We create chances."
Alexis Sanchez's goal made sure to avoid any late pressure from the visitors as the Frenchman admits he was "tempted" to rest the Chilean.
"I was tempted [to rest Sanchez]," added the Arsenal boss.
"[Olivier] Giroud was still suspended today and I knew that it was an important game for us.
"In the end, he always feels ready. He always looked dangerous. He took the corner, he scored a goal and he gave a good chance to Oxlade-Chamberlain.
"He's lively and always dangerous with his change of direction, his incisiveness and how penetrative he is. He's interesting to watch because he has a good fighting spirit.
"He has a good combination of what you want to see from top players - that means that he is ready for a fight and also has talent."
