WATCH LIVE: Eli Tomac goes for third straight Pro Motocross win at Thunder Valley (2 p.m. ET, Live Extra)

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Today the Lucas Oil Pro Motocross Championship heads into the mountains of Colorado with a visit to Thunder Valley Motocross Park for the third round of the season.

Live coverage from Thunder Valley gets underway with the pre-race show at 2 p.m. ET, streaming online exclusively on NBC Sports Live Extra and All four motos will then stream live immediately after, starting with first motos at 3 p.m. ET and then second motos at 5 p.m. ET. Second motos will also air tonight on NBCSN at 8 p.m. ET.

The bad news for the rest of the the field: four motos into the 2015 season, Eli Tomac remains undefeated in the 450 Class. The even worse news: today’s round is in Tomac’s home state.

The defining element of Thunder Valley is the high altitude present in the Colorado mountains. As a result, bikes lose horsepower – which is much-needed for the track’s uphill start – and riders can quickly feel drained if they aren’t used to the thin air.

Fortunately for Tomac, he’ll have a home-field advantage because he lives in Colorado and has experience dealing with the altitude. Even with the presence of former champions Ryan Dungey and Ken Roczen, Tomac looks like the favorite to win his third straight race, especially after being the fastest qualifier in practice today, but anything could happen.

In the 250 Class, Jeremy Martin is looking to bounce back from a troublesome day last week at Glen Helen. The defending 250MX champion had trouble getting his bike started in the first moto and then went down early in the second moto. Both times, he had to start the race from the back of the pack but did well to charge through the field for 6-5 moto finishes and salvage a lot of valuable points.

Marvin Musquin, who is in search of his first career 250MX championship, was able to take advantage of Martin’s misfortunes last week and sweep both motos. Yet to finish worse than second in any moto this year, Musquin enters today with a 19 point lead over Martin and will try to build on his early-season success.

Will Power nips Jack Harvey at finish to pace Road America practice

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Will Power led the only IndyCar Road America practice of the weekend Saturday, shooting to the top of the chart on his 22nd and final lap of the session at 1 minute, 46.0021 seconds in his No. 12 Dallara-Chevrolet.

Dixon knocked Jack Harvey’s No. 60 Dallara-Honda from the top spot (which would have marked the first time that a Meyer-Shank Racing car led practice).

Josef Newgarden, Power’s Team Penske teammate, was third, followed by Felix Rosenqvist and Ryan Hunter-Reay (who went off course late in the session but sustained no damage).

Alex Palou, Colton Herta, Graham Rahal, defending race winner Alexander Rossi and Pato O’Ward rounded out the top 10 in the practice that preceded a Saturday-Sunday race weekend doubleheader for IndyCar at Road America.

PRACTICE RESULTS: Click here to see who was fastest in the session

RACE INFORMATION: What you need to know for today’s REV Group Grand Prix

RATED ROOKIE: Rinus VeeKay rebounding well from a tough debut

IndyCar tested some new cooling devices with cars from Andretti Autosport, Chip Ganassi Racing and Team Penske. Several drivers have said the cockpit heat caused by the new aeroscreen was stifling during last week’s GMR Grand Prix, and IndyCar repositioned drink bottles this weekend to keep liquids cool. The pieces tried by IndyCar during the Road America practice won’t be available during the races Saturday and Sunday at the Elkhart Lake, Wisconsin, road course.

Scott Dixon, who is seeking to open the season with his third consecutive IndyCar victory, was 15th fastest in the 75-minute session. Other notables in Road America practice: Marco Andretti (12th), Simon Pagenaud (19th).

Power is aiming for his second consecutive pole position after qualifying first last week on the Indianapolis Motor Speedway road course.

Qualifying for the REV Group Grand Prix Race #1 will take place at 2:15 p.m. ET (NBCSNNBC Sports Gold).

The broadcast of the IndyCar race at Road America will begin at 5 p.m. on NBCSN.