The summoner name or tag is incorrect
him #6241
SILVER I
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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: 31
307,369
lvl: 16
184,598
lvl: 13
111,627
lvl: 11
93,521
lvl: 9
71,327
lvl: 7
51,056
lvl: 7
48,414
lvl: 7
47,140
lvl: 7
46,369
lvl: 6
39,059
lvl: 6
38,947
lvl: 6
36,621