The summoner name or tag is incorrect
ghostwalker #d34d
SILVER III
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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: 10
85,056
lvl: 10
81,035
lvl: 9
73,477
lvl: 9
69,838
lvl: 9
68,416
lvl: 8
63,791
lvl: 7
52,179
lvl: 7
51,012
lvl: 7
46,184
lvl: 7
45,247
lvl: 6
38,209
lvl: 6
31,930