Formula 1: Spanish Grand Prix, Valencia
World champion Fernando Alonso added to his 2006 championship lead this weekend, in the process becoming the first Spaniard ever to win the Spanish GP. Renault teammate Giancarlo Fisichella failed to hold off Michael Schumacher's Ferrari, losing his P2 starting slot to Schumacher during the first round of pit stops. Fisi finished third, ahead of Ferrari's Felipe Massa, who scored the fastest lap of the race. Next up: the always entertaining Monaco GP. Full race info at grandprix.com or formula1.com. Photo courtesy Renault.

Lots more after the jump...
Rolex Sports Car Series: GAINSCO Grand Prix, Phoenix
Scott Pruett and Luis Diaz won in their Lexus-Riley, putting the Target/Chip Ganassi Racing duo back into the championship lead. Paul Edwards and Kelly Collins won the GT class in their Pontiac GTO.R. Phoenix marked Grand Am's last experiment with the "qualifying race" format - a multi-car Daytona Prototype crash in the Phoenix qualifier was apparently the final nail in the coffin for the concept. Full results here.

MotoGP: Polini Grand Prix of China, Shanghai
Repsol Honda rider Dani Pedrosa scored his first MotoGP victory, ahead of teammate Nicky Hayden. Hayden can take comfort in the fact that he increased his championship lead to 13 points over Loris Capirossi. Yamaha's Colin Edwards took the final podium spot, after teammate Valentino Rossi's charge through the pack was cut short by tire problems as he closed in on Edwards and Suzuki's John Hopkins. More here.

IndyCar Series: Indianapolis 500 Qualifying
Both days of qualifying were scrubbed, leaving all 33 starting spots up for grabs next weekend.

NASCAR Nextel Cup: Dodge Charger 500, Darlington
As expected, Michael Waltrip named Dale Jarrett as his Toyota teammate for the 2007 season. In race action, Kasey Kahne made the race sponsor happy by putting his Dodge on the pole, and leading the early stages of the race, but in the end it was Greg Biffle's Ford that came out on top. A hard-charging Jeff Gordon came up two-tenths of a second short at the stripe to take second, ahead of Matt Kenseth, Jimmie Johnson and Dale Earnhardt Jr. Johnson's points lead extended to 93 over Tony Stewart. Check out nascar.com for the full info.

Champ Car: Grand Prix of Houston
Sebastien Bourdais took the inaugural race around the Astrodome by 1.2 seconds over Forsythe Racing's Paul Tracy, with pole-sitter Mario Dominguez completing the podium trio. Full details here.

American Le Mans Series: Lone Star Grand Prix, Houston
A very rough street circuit took its toll on the high-strung prototypes, as only the bulletproof Audi R8 of Rinaldo Capello and Allan McNish survived the nearly 3-hour event unscathed in the LMP1 class, taking the overall victory by five laps. After running up front for most of the race, the two Penske Porsche Spyders gave up the ghost late in the race with Sebring's electrical and drivetrain problems reappearing in Houston. Blow by blow coverage and photos here.

Corvette C6.Rs finished a remarkable second and third overall, with Olivier Beretta and Oliver Gavin ahead of Ron Fellows and Johnny O'Connell. Despite their considerable weight penalty over the Aston Martins, the Corvettes dominated the GT1 class from the outset.

Alex Job Racing's Mike Rockenfeller and Klaus Graf piloted their Porsche GT3 RSR to victory in GT2, ahead of the Flying Lizard Porsche of Johannes Van Overbeek and Wolf Henzler, and the pole-sitting Ferrari F430 GT of Jamie Melo and Mika Salo.