Southern Arizona’s three world-class rodeo competitors, Sherry Cervi, Cory Petska and Matt Sherwood, are competing for world titles at the ongoing National Finals Rodeo in Las Vegas. Cervi, a Marana High School grad, is in her 19th NFR. She earned $11,000 in Thursday’s opening barrel racing competition to increase her yearly official earnings to $112,000. Petska and Sherwood, who compete in team roping, earned $84,000 and $78,000, respectively, in the regular season.