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: 62
668,595
lvl: 31
360,210
lvl: 23
268,826
lvl: 18
202,223
lvl: 18
196,392
lvl: 17
160,894
lvl: 10
81,030
lvl: 9
77,364
lvl: 9
70,559
lvl: 9
68,286
lvl: 8
54,682
lvl: 7
49,961