Formula Three and Indy Lights Negri raced part-time in the
British Formula Three Championship from 1987 to 1989 with few good results. He returned to his native Brazil in 1990 to race in
Brazilian Formula Three Championship, where he won the championship, and
Formula 3 Sudamericana where he finished ninth. With newfound confidence, he returned to British F3 in 1992 and finished fourth. In 1993, he went to the
Mexican Formula Three Championship and raced there until 1996. In 1997, he raced in
Indy Lights part-time for Genoa Racing and finished 20th. In 1998, he won the Mexican version of Indy Lights, Indy Lights Panamericana. He made one Indy Lights start in 1999 and finished third in Indy Lights Panamericana in 2000.
Grand-Am sports cars Negri moved to sports car racing in 2003 racing in the
Grand-Am Rolex Sports Car Series. He joined
Michael Shank Racing and raced full-time in the series in 2004 and finished 12th in points, winning the league's rising star award which he shared with
Max Angelelli. He captured his first victory in 2006 at
Miller Motorsports Park and finished second in the
24 Hours of Daytona. He finished eighth in points in both 2006 and 2007. In 2008, he finished tenth, winning in the first race held at the
New Jersey Motorsports Park. He stayed with the team in 2009 and finished 8th in points. In 2010, he finished tenth in points and in 2011 improved to a career-best sixth. He won the 24 Hours of Daytona in
2012 for Michael Shank Racing with teammates
A. J. Allmendinger,
John Pew, and
Justin Wilson. It was his first Rolex Sports Car Series win since 2008. ==Racing record==