The summoner name or tag is incorrect
mongster #123
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Match History for Patch: 16.4.1
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Champion Stats for Patch: 16.4.1
Champion Mastery
lvl: 31
315,231
lvl: 10
85,550
lvl: 7
52,870
lvl: 7
47,076
lvl: 7
46,650
lvl: 6
35,999
lvl: 6
33,996
lvl: 5
30,443
lvl: 5
28,248
lvl: 5
26,619
lvl: 5
23,057
lvl: 5
21,879