The summoner name or tag is incorrect
ketsuban #000
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: 47
504,758
lvl: 16
177,374
lvl: 13
114,208
lvl: 12
115,743
lvl: 12
103,686
lvl: 11
89,087
lvl: 11
105,463
lvl: 10
80,711
lvl: 8
60,789
lvl: 7
49,723
lvl: 7
49,390
lvl: 7
48,033