Marieke Guehrer Bio and Pictures 2011Marieke Guehrer Marieke Katherine Guehrer (born 9 February 1986) is an Australian swimmer who is the world record holder in the 50 metres butterfly short course. She clocked 24.99 seconds. After her breakout meet in late 2008, Guehrer broke her personal best times in several events, also breaking the short course 50 m butterfly world record. At the 2009