The summoner name or tag is incorrect
walkondagger #1400
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: 14
135,553
lvl: 11
122,100
lvl: 10
104,425
lvl: 7
51,115
lvl: 6
33,577
lvl: 5
29,547
lvl: 5
26,395
lvl: 5
25,458
lvl: 5
25,055
lvl: 5
24,741
lvl: 5
24,074
lvl: 5
23,873