The summoner name or tag is incorrect
brevec #4444
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: 55
586,691
lvl: 31
316,716
lvl: 24
272,909
lvl: 24
241,904
lvl: 21
198,114
lvl: 20
193,472
lvl: 17
182,965
lvl: 17
170,334
lvl: 15
138,018
lvl: 12
145,461
lvl: 12
136,334
lvl: 11
94,995