The summoner name or tag is incorrect
mars #00021
SILVER III
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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: 8
55,947
lvl: 4
12,862
lvl: 3
8,696
lvl: 3
10,456
lvl: 2
5,960
lvl: 2
4,058
lvl: 2
3,499
lvl: 2
3,458
lvl: 2
1,889
lvl: 1
981
lvl: 1
976
lvl: 1
937