The summoner name or tag is incorrect
EMERALD I
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Match History for Patch: 16.10.1
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Champion Stats for Patch: 16.10.1
Champion Mastery
lvl: 87
946,715
lvl: 86
919,265
lvl: 85
904,350
lvl: 58
643,328
lvl: 57
598,665
lvl: 53
558,713
lvl: 46
474,057
lvl: 43
441,316
lvl: 36
423,240
lvl: 34
340,260
lvl: 25
280,257
lvl: 19
195,261