The summoner name or tag is incorrect
libby #black
GOLD 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: 10
84,181
lvl: 10
82,387
lvl: 8
61,018
lvl: 8
60,449
lvl: 7
48,995
lvl: 7
45,307
lvl: 7
45,301
lvl: 7
43,084
lvl: 6
41,843
lvl: 6
39,552
lvl: 6
39,086
lvl: 6
38,033