The summoner name or tag is incorrect
misty #217
SILVER 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: 15
142,977
lvl: 14
128,111
lvl: 12
113,258
lvl: 12
103,094
lvl: 11
87,017
lvl: 10
84,272
lvl: 9
68,407
lvl: 9
67,902
lvl: 9
108,611
lvl: 8
73,169
lvl: 8
55,470
lvl: 8
55,263