The summoner name or tag is incorrect
SILVER IV
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Match History for Patch: 16.6.1
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Champion Stats for Patch: 16.6.1
Champion Mastery
lvl: 74
786,914
lvl: 45
482,986
lvl: 26
263,594
lvl: 23
223,577
lvl: 21
201,294
lvl: 19
182,524
lvl: 18
180,284
lvl: 16
148,004
lvl: 15
134,462
lvl: 14
121,693
lvl: 14
120,619
lvl: 13
117,753