After a summer of talk about Petr Cech’s ability to help Arsenal end their long title drought, the former Chelsea goalkeeper was guilty of two glaring errors as his new team began the Premier League season with a demoralizing 2-0 defeat to West Ham at the Emirates. To be fair to the long-time Chelsea No. 1, there was more than just his errant decision-making to blame for West Ham’s opener two minutes before halftime, when Cheikhou Kouyate headed in a free-kick. That was the case, too, as West Ham stunningly doubled their lead against the run of play just before the hour mark.