The summoner name or tag is incorrect
mizu #0001
EMERALD I
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Match History for Patch: 16.5.1
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Champion Stats for Patch: 16.5.1
Champion Mastery
lvl: 160
1,727,911
lvl: 72
760,474
lvl: 21
239,745
lvl: 19
221,102
lvl: 17
195,845
lvl: 17
160,964
lvl: 15
184,260
lvl: 13
116,172
lvl: 11
101,674
lvl: 10
79,436
lvl: 9
93,924
lvl: 9
72,686