Premier League champions Chelsea suffered an embarrassing home defeat on the first Saturday of the new season, having two men sent off as unfancied Burnley beat them 3-2 at Stamford Bridge.
Antonio Conte's disjointed side struggled from the early stages when captain Gary Cahill was dismissed for a lunging tackle and they found themselves three-nil down at halftime to a team who gained only seven points away from home all last season.
Wales international Sam Vokes scored two of the goals and Stephen Ward the other.
New signing Alvaro Morata from Real Madrid came on to pull one back midway through the second half and then provided an assist for David Luiz, but in-between midfielder Cesc Fabregas was also sent off for a second yellow card.
It was a dispiriting afternoon for Conte, who won the title in his first season at the club but has complained that Chelsea have not signed enough new players while allowing several to leave.