The summoner name or tag is incorrect
flock #1337
SILVER 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: 19
183,815
lvl: 19
176,832
lvl: 16
152,327
lvl: 16
150,152
lvl: 14
129,445
lvl: 12
98,252
lvl: 12
105,993
lvl: 12
101,655
lvl: 11
93,512
lvl: 11
90,515
lvl: 11
86,660
lvl: 10
86,254