The summoner name or tag is incorrect
hexcore #0001
SILVER III
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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: 69
860,396
lvl: 26
255,110
lvl: 24
299,654
lvl: 18
174,329
lvl: 13
117,675
lvl: 11
91,144
lvl: 10
80,885
lvl: 7
49,992
lvl: 6
53,158
lvl: 6
42,310
lvl: 6
42,051
lvl: 6
41,784