The summoner name or tag is incorrect
fatman #2001
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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: 8
59,508
lvl: 8
56,930
lvl: 7
51,962
lvl: 6
38,946
lvl: 5
31,404
lvl: 4
20,123
lvl: 4
19,641
lvl: 4
16,162
lvl: 4
15,404
lvl: 4
14,499
lvl: 4
13,837
lvl: 4
13,483