The summoner name or tag is incorrect
dark #9767
SILVER I
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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: 7
53,375
lvl: 5
25,037
lvl: 5
23,998
lvl: 5
22,433
lvl: 4
20,416
lvl: 4
19,465
lvl: 4
19,103
lvl: 4
18,827
lvl: 4
16,546
lvl: 4
16,092
lvl: 4
14,570
lvl: 4
13,791