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Arsenal boss Arsene Wenger was delighted to avoid another giant-killing as the Gunners cruised past Middlesbrough 2-0.
Arsenal are the highest ranked team through to the quarter-finals and remain favourites to retain the trophy they won last May.
Wenger hailed his side for their professional approach despite falling off the pace slightly in the second period.
"It's difficult for everybody in the Premier League," he said.
Arsenal v Middlesbrough - player ratings
"It requires focus and good pace and I think we controlled the game. We started well and played with pace and that gave them problems."
He added: "Our fluency was great, our movement was good, our technical control was very good today. We lost a little fraction of urgency at 2-0 but we remained serious for the whole game."
The draw for the quarter-final will be held on BBC One on Monday night ahead of Manchester United's fifth round trip to Deepdale.
