The summoner name or tag is incorrect
jelly #1337
PLATINUM 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: 41
417,163
lvl: 16
156,154
lvl: 13
117,731
lvl: 12
98,528
lvl: 11
118,341
lvl: 11
116,762
lvl: 10
89,783
lvl: 10
85,698
lvl: 10
76,177
lvl: 9
69,356
lvl: 9
66,531
lvl: 8
63,579