The summoner name or tag is incorrect
prisoner #5874
SILVER II
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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: 55
601,535
lvl: 49
512,146
lvl: 42
432,430
lvl: 20
190,758
lvl: 16
143,021
lvl: 12
98,137
lvl: 10
75,920
lvl: 9
75,361
lvl: 9
70,807
lvl: 9
70,336
lvl: 8
56,126
lvl: 6
34,207