The summoner name or tag is incorrect
SILVER III
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Match History for Patch: 16.8.1
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Champion Stats for Patch: 16.8.1
Champion Mastery
lvl: 31
309,711
lvl: 27
265,763
lvl: 26
256,509
lvl: 17
159,184
lvl: 13
112,657
lvl: 13
110,617
lvl: 12
106,585
lvl: 11
95,469
lvl: 11
94,937
lvl: 11
91,786
lvl: 11
91,277
lvl: 11
90,585