The Teessiders looked to have squandered two points having wasted a series of chances, including a 64th-minute Stewart Downing penalty which hit the bar, when Justin Hoyte's own goal cancelled out Afonso Alves' opener.

But the Potters, who had Amdy Faye sent off after 35 minutes, succumbed five minutes from time when Tuncay fired past Thomas Sorensen to snatch victory.

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