The summoner name or tag is incorrect
mazon #mason
EMERALD 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: 40
407,972
lvl: 24
234,704
lvl: 21
245,419
lvl: 17
203,234
lvl: 13
123,002
lvl: 13
114,627
lvl: 12
102,961
lvl: 11
88,042
lvl: 10
85,674
lvl: 9
66,328
lvl: 7
49,397
lvl: 7
43,117