I Would Have Thought Blue

Referees Prefer Athletes in Red

"To test this idea, the researchers showed 42 experienced tae kwon do referees video clips of sparring rounds of five different male competitors of similar abilities. First they were shown the original videos, with one opponent in red gear, the other in blue; then, they were shown the same clips digitally altered so that the colors were reversed (the refs were unaware of the color switch).
On the whole, competitors in red scored an average of 13 percent more points than their opponents in blue. Athletes who started out in blue were awarded more points when they later appeared in red, and those who started out in red received fewer points when in blue.
The study’s findings are detailed in the August issue of the journal Psychological Science."