The summoner name or tag is incorrect
EMERALD III
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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: 53
553,747
lvl: 28
301,888
lvl: 19
200,368
lvl: 17
201,656
lvl: 16
173,758
lvl: 15
168,315
lvl: 14
124,009
lvl: 13
117,549
lvl: 11
94,636
lvl: 11
93,708
lvl: 11
87,666
lvl: 10
86,550