The summoner name or tag is incorrect
brutus #1996
SILVER I
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Match History for Patch: 16.4.1
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Champion Stats for Patch: 16.4.1
Champion Mastery
lvl: 58
637,773
lvl: 49
514,237
lvl: 35
406,883
lvl: 35
405,486
lvl: 22
260,257
lvl: 21
242,293
lvl: 14
165,422
lvl: 14
155,515
lvl: 14
126,492
lvl: 13
154,105
lvl: 12
150,287
lvl: 10
123,621