The opening game is going to be
West Ham - Chelsea. When it comes to the odds:
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West Ham: 4.80
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Draw: 4.00
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Chelsea: 1.71
Chelsea had a bad start. Such a boring effort against Crystal Palace...

But I hope to see better performances tomorrow. West Ham are a mess. We saw them against Sunderland. Chelsea shouldn't have big problems.
The fact that Westham performed very poorly in their opening game against a newly promoted team (Sunderland) would make things a little bit difficult for Chelsea. Quite alright, Chelsea seems to be the favourite team to win here but they shouldn't underrate their opponent because Hammers will come with a full spirit determine to prove a point.
Although, Chelsea dominates the head to head record between the two teams and also win five out of the seven matches against West Ham in the Premier league but unfortunately it doesn't always turn out as expected. I still bet on Chelsea to win but it won't be an easy ride for them against the Hammers.