Four wins from four and top of the league - Sunderland have enjoyed a flawless start to the Championship campaign. So what's been the key to their success so far?

We reflect on the first four games and the many positives to emerge in our latest We Are Sunderland video briefing.

One of the big plusses has been the form of Eliezer Mayenda - but will Sunderland pay the price for not signing a senior experienced striker? We discuss the transfer window after last week's deadline.

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