The summoner name or tag is incorrect
GRANDMASTER I
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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: 56
581,911
lvl: 51
534,755
lvl: 51
529,167
lvl: 51
528,431
lvl: 48
503,939
lvl: 47
497,058
lvl: 44
451,922
lvl: 38
390,199
lvl: 36
403,320
lvl: 32
319,190
lvl: 27
271,763
lvl: 26
256,641