The summoner name or tag is incorrect
bev #5634
SILVER IV
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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: 18
169,368
lvl: 15
136,453
lvl: 14
119,660
lvl: 13
109,572
lvl: 8
59,252
lvl: 8
58,027
lvl: 6
42,547
lvl: 5
29,014
lvl: 4
18,763
lvl: 4
17,866
lvl: 4
15,645
lvl: 4
15,337