March 15/16This weekend marks the return of live United Sportscar Championship coverage with round two of the season, the 12 Hours of Sebring. It’s been a long seven weeks since Daytona and everyone will be eager to get back on track at Sebring International Raceway.Now in its 62nd year, the prestigious event attracts teams and drivers from other series who frequently use the former grand prix venue to prepare for the Le Mans 24 Hours. Although Joao Barbosa, Christian Fittipaldi and Sebastien Bourdais top the standings, they will head into the unknown this weekend, as the Daytona Prototype machines finally make their Sebring debut against the seasoned LMP2 runners.We continue the feast of Stateside action with live fourth round coverage of the NASCAR Nationwide Series from Bristol Motor Speedway in Tennessee as Regan Smith looks to build on his slender lead in the championship.In Las Vegas, Sprint Cup regular Brad Keselowski claimed his maiden Nationwide triumph en route to a weekend clean sweep of both races, while Kyle Busch - trying to score his first victory in Nevada - finished just behind for the second year running. He will aim to return to winning ways by repeating his 2013 victory at Bristol on Saturday.Meanwhile, series-leader Smith will be looking to quickly reassert some authority if he is to give his title campaign credibility.The High Speed Television Channel also has highlights of the Sunoco Rolex 24 Daytona Challenge, a European-based competition that pits drivers in different series against each other for the ultimate prize: a place in the iconic 24 hour race.Moving to the snow and ice of northern Europe, we have coverage of the FIM Snowcross World Championship’s sole round from Skelleftea, Sweden. Can reigning title-holder Adam Renheim blast his way to a second consecutive crown?And there’s also another chance to see third round highlights of the FIA World Rally Championship from Mexico as the internal title battle continues to develop at Volkswagen.Saturday 15 March10:35 FIM Snowcross World Championship – Highlights11:05 FIA World Rally Championship, Rd 3, Mexico – Highlights13:00 Sunoco Rolex 24 Daytona Challenge14:00 LIVE United Sportscar Championship, Rd 2, Sebring18:00 LIVE NASCAR Nationwide Series, Rd 4, Bristol20:30 LIVE United Sportscar Championship, Rd 2, SebringSunday 16 March06:00 FIM Motocross World Championship, Rd 2, Thailand – Replay10:35 United Sportscar Championship, Rd 2, Sebring – Highlights15:45 Roger Albert Clark Rally Championship, Red Kite Rally21:00 NASCAR Nationwide Series, Rd 4, Bristol – Highlights All times are GMT