The summoner name or tag is incorrect
sheik #8008
EMERALD IV
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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: 101
1,081,837
lvl: 53
555,224
lvl: 46
478,007
lvl: 36
367,525
lvl: 32
326,513
lvl: 21
230,092
lvl: 15
135,258
lvl: 14
125,093
lvl: 13
115,860
lvl: 11
94,079
lvl: 11
88,394
lvl: 10
104,808