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: 241
2,867,637
lvl: 52
572,003
lvl: 30
297,127
lvl: 24
330,077
lvl: 21
219,428
lvl: 19
176,172
lvl: 19
174,990
lvl: 17
187,717
lvl: 16
145,021
lvl: 14
134,770
lvl: 13
117,622
lvl: 13
110,522