The summoner name or tag is incorrect
dave #d123
GOLD I
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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: 52
539,038
lvl: 30
341,741
lvl: 28
281,124
lvl: 22
239,760
lvl: 15
130,934
lvl: 13
113,942
lvl: 12
99,272
lvl: 12
98,177
lvl: 12
138,461
lvl: 12
102,702
lvl: 12
102,462
lvl: 11
98,776