This season, Brady Singer proved he’s capable of being the lead figure in the Kansas City Royals’ pitching rotation. But a season of maturity and strides ended on a sour note as Singer got roughed up by a division rival for a five-run inning in his final start of the season. Singer lost for the first time since the first week of August as the Royals fell, 6-3, to the Cleveland Guardians in front of an announced 19,753 in the first game of a six-game series between the teams at Progressive Field in Cleveland. The Royals (63-94) lost their fourth straight game in starting their season-ending roa…