The summoner name or tag is incorrect
ongbakdiff #na1
SILVER I
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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: 23
267,276
lvl: 3
9,974
lvl: 3
7,845
lvl: 2
5,269
lvl: 2
4,021
lvl: 2
2,898
lvl: 2
2,361
lvl: 2
2,251
lvl: 2
1,892
lvl: 1
979
lvl: 1
867
lvl: 1
807