MYKHAILO MUDRYK got his Chelsea career up and running with his first goal for the club in a landmark victory for Mauricio Pochettino.
The Ukraine international has struggled to find his feet for the Blues since arriving from Shakhtar Donetsk for £88m in January.
But he is finally off the mark with a fizzing second half volley to make it two wins from two for new boss Pochettino in the United States.
Danny Welbeck had given Brighton the lead early on before £52m new-boy Christopher Nkunku levelled with his second goal of the tour.
A rash second yellow card for Seagulls defender Jan Paul van Hecke on the hour mark then opened the floodgates for the West Londoners, in front of over 65,000 fans in Philadelphia.