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: 25
249,236
lvl: 17
165,117
lvl: 12
136,958
lvl: 12
133,687
lvl: 11
97,659
lvl: 10
116,498
lvl: 10
107,484
lvl: 9
83,560
lvl: 9
73,797
lvl: 9
67,324
lvl: 9
66,938
lvl: 9
66,292