The summoner name or tag is incorrect
lookdown #0225
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: 20
192,695
lvl: 15
140,078
lvl: 12
125,165
lvl: 12
107,494
lvl: 12
106,169
lvl: 11
91,269
lvl: 10
82,742
lvl: 10
81,388
lvl: 10
78,121
lvl: 10
77,668
lvl: 10
76,579
lvl: 9
86,301