The summoner name or tag is incorrect
starbuck #13117
SILVER III
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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: 39
403,894
lvl: 33
337,606
lvl: 29
289,673
lvl: 26
261,749
lvl: 21
241,023
lvl: 19
216,361
lvl: 17
174,397
lvl: 12
106,919
lvl: 11
92,505
lvl: 9
68,544
lvl: 8
56,190
lvl: 7
50,537