LONDON (AP) — Chelsea handed Arsene Wenger one of his most demoralizing defeats as Arsenal manager as his 1,000th game ended in a 6-0 rout, and the referee also endured embarrassment at Stamford Bridge on Saturday.
Chelsea earned its biggest league victory under Jose Mourinho after the leaders raced into a 2-0 lead in just seven minutes through goals from Samuel Eto'o and Andre Schuerrle.
"You come to kill and in 10 minutes we destroyed," Mourinho said. "After that? Easy."
Not for the referee, as Andre Marriner provided the London derby's big talking point by sending off the wrong Arsenal player after 15 minutes.
Although Alex Oxlade-Chamberlain blatantly handled to keep out Eden Hazard's shot, it was Kieran Gibbs who was dismissed despite his teammate's protests.
"Andre is disappointed that he failed to identify the correct player," the league referees' body said in a statement. "He expressed his disappointment to Arsenal when he was made aware of the issue."
Hazard scored Chelsea's third from the resulting penalty, Oscar netted twice and Mohamed Salah completed Wenger's misery with his first goal for the leaders.
Arsenal saw its title ambitions seriously dented as it fell seven points behind Chelsea, and dropped to fourth.
"It's one of the worst days (in my career)," Wenger said. "It's over after 20 minutes and it's a long game after that."
After the humiliation Wenger did not attend the mandatory post-match news conference, with Arsenal media chief Mark Gonnella saying the team bus had to leave while Mourinho was addressing reporters.
The Frenchman couldn't get away quick enough after another gloomy landmark day at Stamford Bridge. His 500th game in charge also saw Arsenal lose at Chelsea, albeit only 1-0 in 2005.
The margin of this defeat matched the previous low-point of Wenger's 18-year reign — an 8-2 loss at Manchester United. It was also Arsenal's third big away loss against its direct title rivals this season, following a 6-3 defeat at Manchester City and 5-1 drubbing at Liverpool.
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