Yes, the Kansas City Royals did indeed suffer a hangover effect following games in which Joakim Soria gave up a lead. Kansas CIty is 5-6 in games immediately following a Soria gaffe (excluding his failure on September 20, since the team has yet to play another game).
If we extend the scope to three games following Soria’s failures, the KC Royals are 15-18. That’s sub .500 records both one and three games following Soria blowing a lead. That’s not very good when you consider Kansas City is currently a .510 team. The Royals winning percentage improves to .