Andros Townsend had his penalty saved as a weakened Crystal Palace were beaten by League Two Colchester in a Carabao Cup shootout.
After Townsend squandered the first spot-kick following a goalless 90 minutes, Noah Chilvers gave the U’s their first EFL Cup win against top-flight opponents since 1979.
Despite making 10 changes to the side that won at Manchester United in the Premier League on Saturday, Palace manager Roy Hodgson still fielded seven internationals for this second-round tie.
Belgium forward Christian Benteke went closest to making the breakthrough for the hosts – he had an early effort saved by visiting keeper Dean Gerken, then hit the crossbar.
Palace introduced Jordan Ayew and Wilfried Zaha after the break as they searched for a winning goal, but John McGreal’s side held firm.