The summoner name or tag is incorrect
ecco #20000
EMERALD IV
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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: 37
383,090
lvl: 25
244,218
lvl: 17
160,455
lvl: 14
125,853
lvl: 11
92,371
lvl: 11
91,977
lvl: 11
91,435
lvl: 11
91,051
lvl: 10
82,311
lvl: 10
82,024
lvl: 10
78,275
lvl: 9
68,127