The summoner name or tag is incorrect
cupcakexxi #999
IRON I
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Match History for Patch: 16.6.1
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Champion Stats for Patch: 16.6.1
Champion Mastery
lvl: 41
440,441
lvl: 16
265,007
lvl: 16
150,891
lvl: 14
192,984
lvl: 14
128,719
lvl: 14
119,965
lvl: 12
107,483
lvl: 11
87,915
lvl: 10
84,306
lvl: 9
73,365
lvl: 9
69,713
lvl: 8
63,141