The summoner name or tag is incorrect
SILVER I
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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: 21
207,094
lvl: 18
172,972
lvl: 17
153,696
lvl: 14
123,168
lvl: 13
119,343
lvl: 13
118,616
lvl: 12
106,925
lvl: 11
96,739
lvl: 11
93,820
lvl: 11
86,918
lvl: 10
81,934
lvl: 10
80,906