West Ham had more possession, more shots, more shots on target and more touches in the opposition box than Chelsea on Saturday.
However, xG shows that the quality of chances was key to the final outcome - a 3-0 win for the visitors.
The chances West Ham created were of a lower quality, hence their xG number of less than one, while the chances they gave up to the Blues were very good.
Statistics collated by BBC Sport statistician Chris Collinson
New England believes Maye gives them their best chance to win now. But is this defensible short-term decision also the best long-term move?
Week 5 has come and gone. Time to set our sights for Week 6. Matt Harmon and Sal Vetri are back for another 'Data Dump Wednesday' by sharing 10 data points you need to know for Week 6 to maximize your fantasy lineups.
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The Yahoo Fantasy team reveals their Week 6 PPR wide receiver rankings.
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Tiant won 229 games with six teams in his 19-year MLB career.
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Which team has the No. 1 spot after five weeks of the NFL season?
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Yahoo Sports