Tottenham Hotspur lead 1-0 at London Stadium after Pape Matar Sarr opened the scoring early in the second half.
The Irons started strongly and went close to taking a 14th minute lead when Kyle Walker-Peters led a break down the right. Jarrod Bowen then passed to Lucas Paquetá, who sold Pedro Porro a dummy but then placed his shot wide.
Tottenham thought they had taken the lead shortly afterwards, but Micky van der Ven was penalised for a push on Walker-Peters before Cristian Romero headed Mohammed Kudus' corner home.
The visitors grew in strength as the half wore on, but the Irons repelled their efforts to ensure they went back to the changing rooms level.
However, the north Londoners were proving dangerous from set-pieces and a corner two minutes after the break paved the way for the game's first goal as Sarr found space at the back post to nod into the net.
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