Newcastle United striker Alexander Isak was one of the Magpies’ heroes against Sunderland, but he was massively helped out by his teammate. The 24-year-old scored twice as Newcastle won the Tyne-Wear derby 3-0, beating rivals Sunderland to advance to the fourth round of the FA Cup. It was a dominant display by the Magpies, who were comfortable against a Sunderland side that failed to really lay a glove on Eddie Howe’s side. There were plenty of standout performances in black and white. Alexander Isak took both of his goals well, while Bruno Guimaraes was probably Newcastle’s man of the match. …