The summoner name or tag is incorrect
buffington #123
EMERALD IV
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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: 12
98,204
lvl: 12
108,460
lvl: 12
105,287
lvl: 12
100,456
lvl: 11
94,095
lvl: 11
89,075
lvl: 10
96,104
lvl: 10
83,638
lvl: 9
81,908
lvl: 9
74,204
lvl: 8
62,179
lvl: 8
56,706