The summoner name or tag is incorrect
tsim #mist
EMERALD III
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Match History for Patch: 16.10.1
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Champion Stats for Patch: 16.10.1
Champion Mastery
lvl: 347
4,149,037
lvl: 38
471,219
lvl: 28
349,286
lvl: 20
194,813
lvl: 11
92,311
lvl: 11
90,262
lvl: 10
75,911
lvl: 9
70,449
lvl: 9
70,357
lvl: 8
59,119
lvl: 8
54,704
lvl: 6
32,023