Enzo Maresca's style is exposed in debut, set pieces challenge Blues, and Levi Colwill shows some fight: FIVE THINGS WE LEARNED as Chelsea can only draw with League One Wrexham

KIERAN GILL AT LEVI'S STADIUM IN SANTA CLARA - Enzo Maresca's debut as Chelsea's head coach served as a wakeup call for anyone who thought it would be easy.