Motors TV’s flourishing sportscar line-up continues this weekend with live coverage of the Blancpain Endurance Series season-opener from Monza. Reigning Pro Cup champions Marc VDS Racing return with their BMW Z4 GT3, while Nurburgring 1000km and 24 Hours of Spa winners HTP Motorsport will try to overhaul the Belgian squad with their Mercedes-Benz SLS AMG GT3.We travel from northern Italy to the sultry Californian streets next for live third-round United SportsCar Championship coverage from Long Beach as the series visits the Golden State for two consecutive races. Only the Prototype and GT Le Mans machines participate on the Pacific coast, with Action Express’ trio of Joao Barbosa, Christian Fittipaldi and Sebastien Bourdais looking to stretch their top-tier lead. Meanwhile, in the hotly-contested GTLM class, Porsche North America are aiming to repeat their Daytona and Sebring victories.We’re also heading east to Darlington Raceway, South Carolina for delayed-as-live NASCAR Nationwide Series coverage of round seven.Sprint Cup domination was broken for the first time since Daytona last weekend in Texas, with rookie Chase Elliott scoring his maiden Nationwide victory that vaulted him to the top of the standings. Long-time leader Regan Smith is now second, while Kyle Busch will try to score consecutive wins at ‘The Lady in Black.’Returning to Italy, the High Speed Television Channel has delayed-as-live coverage of the FIM Motocross World Championship’s fourth round from Arco di Trento where reigning MXGP champion Tony Cairoli will envisage another glorious homecoming. Meanwhile in MX2, Swiss rider Arnaud Tonus claimed his first Grand Prix victory in Brazil, topping the championship standings in the process. With Jeffrey Herlings absent through injury, the title-holder drops to an unfamiliar fourth ahead of this year’s first Italian round.And we also have third-round highlights of V8 Supercars from Winton where team-mates Craig Lowndes and Jamie Whincup will hope to keep it clean following their clash in Tasmania, while the supporting V8 Utes Racing Series makes its 2014 bow in Adelaide with Ryal Harris seeking a third consecutive title.Saturday 12 April14:15 V8 Supercars, Rd 3, Winton – Highlights17:20 V8 Utes, Rd 1, Adelaide – Highlights 21:00 NASCAR Nationwide Series, Rd 7, Darlington – Delayed-as-Live 23:00 LIVE United SportsCar Championship, Rd 3, Long BeachSunday 13 April11:05 United SportsCar Championship, Rd 3, Long Beach – Highlights 13:15 LIVE Blancpain Endurance Series, Rd 1, Monza17:15 FIM MX2 Motocross World Championship, Rd 4, Italy – Delayed-as-Live18:15 FIM MXGP Motocross World Championship, Rd 4, Italy – Delayed-as-LiveAll times are BST