The summoner name or tag is incorrect
grayson #sigma
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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: 10
97,464
lvl: 7
53,364
lvl: 6
39,500
lvl: 6
38,882
lvl: 6
35,724
lvl: 6
34,441
lvl: 5
22,806
lvl: 4
22,915
lvl: 4
21,037
lvl: 4
19,044
lvl: 4
18,873
lvl: 4
18,833