The summoner name or tag is incorrect
grassmuncher #36985
SILVER II
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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: 41
425,448
lvl: 16
148,302
lvl: 11
91,032
lvl: 7
52,956
lvl: 6
40,195
lvl: 5
30,534
lvl: 5
28,295
lvl: 5
23,388
lvl: 5
23,326
lvl: 5
22,179
lvl: 4
14,109
lvl: 4
12,986