The summoner name or tag is incorrect
ghoster #5715
SILVER IV
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Match History for Patch: 16.10.1
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Champion Stats for Patch: 16.10.1
Champion Mastery
lvl: 14
173,232
lvl: 12
144,885
lvl: 10
84,142
lvl: 9
68,161
lvl: 8
58,858
lvl: 7
65,301
lvl: 7
59,289
lvl: 7
50,358
lvl: 7
49,078
lvl: 7
48,838
lvl: 6
43,031
lvl: 6
39,502