The summoner name or tag is incorrect
dockstern #5703
SILVER II
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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
86,421
lvl: 10
76,106
lvl: 8
62,531
lvl: 7
51,042
lvl: 7
46,475
lvl: 6
42,206
lvl: 6
41,254
lvl: 6
40,959
lvl: 6
38,023
lvl: 6
37,838
lvl: 6
37,575
lvl: 6
37,386