The summoner name or tag is incorrect
potatoman #9999
SILVER IV
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Match History for Patch: 16.4.1
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Champion Stats for Patch: 16.4.1
Champion Mastery
lvl: 64
1,036,747
lvl: 22
209,482
lvl: 12
102,860
lvl: 11
87,966
lvl: 10
82,244
lvl: 8
63,960
lvl: 7
46,531
lvl: 7
44,385
lvl: 6
33,778
lvl: 5
30,909
lvl: 5
30,580
lvl: 5
29,915