The summoner name or tag is incorrect
saintfoo #1234
EMERALD III
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Match History for Patch: 16.9.1
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Champion Stats for Patch: 16.9.1
Champion Mastery
lvl: 391
4,274,951
lvl: 291
3,169,390
lvl: 41
422,447
lvl: 30
298,098
lvl: 28
325,266
lvl: 23
221,557
lvl: 14
123,950
lvl: 10
84,667
lvl: 10
76,798
lvl: 9
73,859
lvl: 9
72,500
lvl: 8
58,443