The summoner name or tag is incorrect
SILVER III
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Match History for Patch: 16.8.1
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Champion Stats for Patch: 16.8.1
Champion Mastery
lvl: 32
361,272
lvl: 29
306,828
lvl: 15
180,709
lvl: 13
144,527
lvl: 10
88,320
lvl: 10
108,119
lvl: 9
90,576
lvl: 9
66,329
lvl: 8
79,481
lvl: 7
65,747
lvl: 7
48,326
lvl: 7
48,031