Just days after U.S. cyclocross season kicked off in earnest at CrossVegas, the top U.S.-based pros were back at it, taking on two days of racing in Boulder, Colorado, this past weekend. Action kicked off at the U.S. Open of Cyclocross at the Boulder Reservoir, then came the premier event of the weekend, the famed Boulder Cup held at Valmont Bike Park. To no one's surprise the big winners were Jeremy Powers and Katie Compton, who each picked up a pair of race wins in the Centennial State. Here's a look at some of the action from Sunday's race.

Boulder-Cup-Front

Boulder local Allen Krughoff (Noosa Pro Cycling) took the early lead ahead of multi-time national champion Jonathan Page (XcelLED) with Tim Johnson (Cannondale-Cyclocrossworld) and Jeremy Powers (Aspire Racing) trailing in third and fourth. Photo by Jason Sumner

Boulder-Cup-Stairs

Just a few laps in and it was a race of three. Here Krughoff leads Johnson and Powers up the menacing 5280 Steps at Boulder's Valmont Bike Park. Photo by Jason Sumner

Boulder-Cup-Summerhill-Lean

Just back from a long road racing season, Danny Summerhill had a respectable day, finishing ninth. Photo by Jason Sumner

Boulder-Cup-Wells

Mountain biking star Todd Wells (Specialized) is also a top cyclocross racer, having multiple national titles to his name. But on this day he ended up seventh. Photo by Jason Sumner

Boulder-Cup-Powers-Leads

After blowing up the main field Powers went to the front and started putting pressure on his two adversaries. Photo by Jason Sumner

Boulder-Cup-Powerss

Soon Powers was alone at the front, just as he'd done last January when he won the U.S. national title at this exact same venue. Photo by Jason Sumner

Boulder-Cup-Allen

Krughoff is a rising star in the U.S. scene, and managed to dispatch Johnson, slotting into second. Photo by Jason Sumner

Boulder-Cup-Johnson2

Johnson held firmly in third aboard his Cannondale race bike. All the top three finishers were on disc-brake equipped bikes. Photo by Jason Sumner

Boulder-Cup-Wells2

Recently crowned Leadville 100 champion - and new dad - Todd Wells had a steady if unspectacular day. Photo by Jason Sumner

Boulder-Cup-Powers

Powers was simply untouchable, showing the same form that earned him a third place in CrossVegas behind European superstars Sven Nys and Lars van der Haar. Photo by Jason Sumner

Boulder-Cup-Johnson

Johnson is a longtime veteran of the cyclocross circuit, having first burst onto the scene in 1999 when he took third in the under-23 world championships race. Photo by Jason Sumner

Boulder-Cup-Powers-Stairs

Powers glides up the stairs on his way to win No. 2 of the 2014-2015 'cross season. Photo by Jason Sumner

Boulder-Cup-Compton

In the women's race, Trek's Katie Compton was her usual untouchable self, earning a dominating solo win. Photo by Jason Sumner

Boulder-Cup-Racer

The Boulder Cup course was a tough mix of high speed sections, bumpy grass, and several nasty short climbs that went straight uphill. Photo by Jason Sumner

Boulder-Cup-Expo

Valmont Bike Park is a perfect setting for big time racing - with plenty of expo space as well. Photo by Jason Sumner

Boulder-Cup-Warm-Up

Members of the Raleigh-Clement team warm-up ahead of the action. Photo by Jason Sumner

Boulder-Cup-Wells-Crux

Todd Wells' Specialized Crux is actually last year's model and has yet to be updated with SRAM's new HydroR brakes. Instead he used mechanical discs brakes. Photo by Jason Sumner

Boulder-Cup-Mitch-Felt

Local pro Mitch Hoke's Felt 'cross machine. Hoke was 11th at Valmont racing for the newly formed Pro's Closet Development Team. Photo by Jason Sumner

Boulder-Cup-Johnson-Cannond

Tim Johnson's Cannondale was notable in that it had a set of prototype Zipp 303 disc wheels. Photo by Jason Sumner