Óscar Miguel Sevilla Rivera, nicknamed El Niño, is a Spanish-Colombian professional road bicycle racer, who currently rides for UCI Continental team Team Medellín. He is a climber with a pedigree in stage races, having finished in the top ten of the Tour de France and Vuelta a España several times.

Rock Racing was a cycling team founded in 2007 by Michael Ball. The team is affiliated with Ball's Rock & Republic clothing line. Rock Racing received media attention for hiring outcasts in the sport, including those tainted by performance-enhancing drug scandals. The team's "bad boy image" was furthered by the design of the team kits, and its motto was "Here to stay" which may have served to incite the anti-doping efforts of the time.