Two goals from Ashley Fletcher as well as strikes from Marcus Tavernier and Marvin Johnson saw the Teessiders reach the next round of the competition.
Our Boro writer Joe Nicholson has dished out his marks following the match – scroll down and flick through our picture gallery to see them:
9. Marcus Tavernier - 7
Looked busy and was keen to get on the ball. Scored Boro’s fourth after his shot was deflected. 7 Photo: Clive Brunskill
10. Ashley Fletcher - 7
Wasn’t always involved but took his chances when they came. Two goals to start the campaign. 7 Photo: Alex Livesey
11. Britt Assombalonga - 6
Captained the side but struggled to make an impact. Worked hard. Late shot was straight at the keeper. 6 Photo: Jan Kruger
12. Nathan Wood - N/A
(for Fry, 75) - Came on in the closing stages. N/A Photo: Matthew Lewis