The summoner name or tag is incorrect
EMERALD 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: 50
525,122
lvl: 39
404,553
lvl: 25
242,856
lvl: 23
219,549
lvl: 21
205,296
lvl: 19
182,857
lvl: 15
137,379
lvl: 13
117,198
lvl: 13
111,576
lvl: 12
99,107
lvl: 12
103,267
lvl: 10
85,933