Chelsea defeated Tottenham 2-1 at White Hart Lane in the first-leg of their FA Youth Cup semifinal.
Jody Morris's side controlled proceedings as headers from Reece James and Ike Ugbo gave the holders a two-goal lead in North London.
The hosts struck a late goal through Kazaiah Sterling that keeps their hopes alive ahead of the second leg this Saturday at Stamford Bridge.
Morris made three changes from the quarter-final win over Leicester City as Jamie Cumming, Tariq Uwakwe and Juan Castillo came into the side.