The summoner name or tag is incorrect
jester #1991
EMERALD III
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Match History for Patch: 16.4.1
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Champion Stats for Patch: 16.4.1
Champion Mastery
lvl: 18
164,638
lvl: 17
161,541
lvl: 17
160,735
lvl: 16
143,112
lvl: 14
127,732
lvl: 13
109,772
lvl: 11
94,948
lvl: 11
90,054
lvl: 11
87,769
lvl: 11
87,220
lvl: 10
82,473
lvl: 10
82,271