Guillermo "Memo" Rojas Jr. (born August 18, 1981) is a Mexican professional race car driver. Successful in American sports car racing, Rojas is a four-time series champion in the Rolex Sports Car Series, a three-time winner of the 24 Hours of Daytona, and a two-time European Le Mans Series champion. He is the first Mexican driver to win a major American racing championship.