The summoner name or tag is incorrect
teamplayer #1234
SILVER IV
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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: 22
209,324
lvl: 17
192,840
lvl: 9
96,705
lvl: 8
69,749
lvl: 8
61,518
lvl: 7
47,748
lvl: 7
45,189
lvl: 6
46,656
lvl: 6
39,018
lvl: 6
33,134
lvl: 6
32,971
lvl: 6
31,871