The summoner name or tag is incorrect
sandman #9211
GOLD III
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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: 38
392,345
lvl: 21
219,799
lvl: 16
165,194
lvl: 14
119,824
lvl: 13
111,331
lvl: 12
97,630
lvl: 12
102,966
lvl: 11
93,261
lvl: 10
84,712
lvl: 10
84,540
lvl: 10
81,021
lvl: 10
79,896