Highly-rated Ruben Loftus-Cheek's first senior goal settled a niggly FA Cup third round tie as Chelsea ground past Scunthorpe 2-0 at Stamford Bridge.
Diego Costa's fourth goal in three games handed Chelsea the perfect start, only for Guus Hiddink's men to drift off and allow League One side Scunthorpe to turn the tie into a scrap.
The 19-year-old Loftus-Cheek's composed finish secured Chelsea safe passage to the fourth round, though, after Scunthorpe were denied a second-half penalty.
Chelsea will hope England Under-21 star Loftus-Cheek's tidy performance points to a coming of age, after limited past opportunities.
Interim Blues boss Hiddink will be heartened by hit man Costa taking another step forward in his fight for top form.
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