The World's Best 10K (WB10K) was a road race of 10 kilometers celebrated in San Juan, Puerto Rico every year.

The event was also the first race transmitted live through the Internet, with audio, video and results.

[citation needed] WB10K was ranked among the 20 most competitive races in the world.

In 2003, Paula Radcliffe of England completed the course in a world record time of 30 minutes 21 seconds.

The men's race at the 2010 edition, won by Rigoberto Gaetán, had six runners break the 28 minute mark.