The game had been 0-0 at half time but Chelsea improved after the interval and went ahead within 10 minutes of the restart.
Good work down the right from USMNT star Christian Pulisic set up Werner, whose initial goal-bound effort was kept out by teammate Michy Batshuayi.
Luckily for Batshuayi, his unintentional block rebounded straight back to Werner who tidied up at the second time of asking.
Club America were gifted an equalizer when James played a blind pass back to goalkeeper Marcus Bettinelli who reacted too slowly.
Fortunately for Chelsea, the own goal did not cost them the win.
Next up for Thomas Tuchel’s side is a trip to Charlotte FC on Wednesday.
What an effort!
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