The summoner name or tag is incorrect
abcslayer #1234
PLATINUM IV
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Match History for Patch: 16.9.1
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Champion Stats for Patch: 16.9.1
Champion Mastery
lvl: 73
858,265
lvl: 7
52,887
lvl: 5
28,094
lvl: 5
25,122
lvl: 4
15,859
lvl: 4
12,852
lvl: 3
9,999
lvl: 3
9,667
lvl: 3
8,336
lvl: 3
7,501
lvl: 3
7,031
lvl: 3
6,941