The summoner name or tag is incorrect
GRANDMASTER 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: 387
4,636,076
lvl: 90
956,531
lvl: 17
201,395
lvl: 16
143,055
lvl: 14
139,718
lvl: 12
152,091
lvl: 12
127,153
lvl: 11
93,982
lvl: 11
90,723
lvl: 11
88,378
lvl: 11
119,740
lvl: 10
91,096