The summoner name or tag is incorrect
pyro #7802
SILVER IV
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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: 10
83,553
lvl: 10
77,150
lvl: 9
74,747
lvl: 9
67,712
lvl: 9
64,783
lvl: 8
60,179
lvl: 8
59,898
lvl: 8
59,746
lvl: 7
49,256
lvl: 7
48,047
lvl: 7
47,411
lvl: 7
46,765