Arsenal's 3-1 victory over Sunderland in the FA Cup on Saturday was a routine, low-key display with only one truly outstanding performer: Hector Bellerin.
The Spaniard stormed forward to grab two second-half assists and provided a reminder that, among the praise their attacking players receive, Arsenal boast the Premier League's outstanding right-back.
This has been an entirely sudden development. Bellerin was highly rated when joining Arsenal from Barcelona in 2011, aged just 16, and impressed for the Gunners' youth sides. His pace was his standout weapon -- there are stories about him beating Theo Walcott's sprint times -- but coaches also frequently remarked upon Bellerin's professionalism and his work rate.