The summoner name or tag is incorrect
peter #0901
SILVER III
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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: 26
260,054
lvl: 23
222,627
lvl: 20
191,780
lvl: 18
171,018
lvl: 16
143,996
lvl: 15
140,190
lvl: 15
134,283
lvl: 15
133,237
lvl: 14
121,224
lvl: 13
115,321
lvl: 13
115,042
lvl: 12
100,354