(CNN) -- Record-breaking swimmer Michael Phelps was left stunned when his golden run at the U.S. national championships came to an abrupt halt, leaving his overall title tally stuck on 50.
The 14-time Olympic champion suffered a shock defeat to longtime rival Ryan Lochte in the 200-meter individual medley in Irvine, California on Friday.
It was Phelps' first defeat of the week, and his first in the discipline in 38 championship races.
The 25-year-old became the first U.S. swimmer to reach 50 national titles when he won the 100m butterfly on Thursday. CNN
