The summoner name or tag is incorrect
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: 63
667,398
lvl: 41
426,665
lvl: 32
319,678
lvl: 23
223,800
lvl: 20
194,054
lvl: 14
128,141
lvl: 13
119,068
lvl: 12
107,572
lvl: 11
93,114
lvl: 10
85,991
lvl: 10
81,358
lvl: 9
73,937