The summoner name or tag is incorrect
jester #10101
PLATINUM IV
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Match History for Patch: 16.9.1
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Champion Stats for Patch: 16.9.1
Champion Mastery
lvl: 28
311,446
lvl: 15
132,730
lvl: 14
147,068
lvl: 12
121,763
lvl: 12
104,739
lvl: 11
111,673
lvl: 10
80,947
lvl: 10
77,234
lvl: 9
72,088
lvl: 8
61,131
lvl: 8
59,638
lvl: 8
55,044