It was a Kenyan sweep in the men's race as defending champion Daniel Limo finished third.
Kenyans Daniel Limo and Ogla Kimaiyo take the overall victories on a warm day.
The 31-year-old is excited to compete for a national title on March 15.
The 25-year old took over 13 minutes off her 26.2-mile personal best at last weekend's ASICS L.A. Marathon.
American Lauren Kleppin, who trains with the Mammoth Track Club, was third in a personal-best 2:28:48.
A February race date and national TV broadcast helped secure the winning bid.
The troubled actress has been working with Shannon Rowbury on her running since leaving rehab last month.
Now a Masters athlete, Kastor finishes third in the elite field in Los Angeles.
27-year-old's time of 2:26:08 breaks the Belarusian national record.
Deena's husband to oversee the LA Roadrunners Training Program.