The summoner name or tag is incorrect
roma #1400
SILVER IV
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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: 42
521,743
lvl: 22
219,048
lvl: 15
139,686
lvl: 13
109,493
lvl: 12
101,001
lvl: 11
93,856
lvl: 10
76,727
lvl: 9
67,314
lvl: 9
66,063
lvl: 8
58,553
lvl: 7
47,091
lvl: 7
45,790