Some race registration news for you to start Wednesday:

First, the MCM10K, opens at noon ET, and will be available at http://www.marinemarathon.com/

The 6.2-mile race is run in conjunction with the Marine Corps Marathon:

The MCM10K will host 10,000 runners ages 10 and above for the 6.2 mile event occurring in conjunction with the 37 MCM on Sunday, Oct. 28. Now in its seventh year, the MCM10K offers a new course featuring more mileage along the National Mall in Washington D.C.

Additionally, the Big Sur Half Marathon -- Competitor Magazine's "Best Half Marathon" -- is now open for a discounted "Early Bird Special" registration, with rates increasing on April 16.

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