The summoner name or tag is incorrect
prancer #520
SILVER II
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Match History for Patch: 16.9.1
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Champion Stats for Patch: 16.9.1
Champion Mastery
lvl: 38
396,736
lvl: 8
63,894
lvl: 8
54,761
lvl: 7
53,534
lvl: 7
52,030
lvl: 7
45,846
lvl: 6
36,198
lvl: 6
35,822
lvl: 6
35,262
lvl: 6
34,712
lvl: 6
33,334
lvl: 5
38,212