A son of Vronsky sold for $100,000 to top the California Thoroughbred Breeders Association Northern California Yearling and Horses of Racing Age Sale, which posted year-over-year result increases, the auction said in a release late Tuesday. With 114 yearlings sold, gross sales were $1,064,900 for an average of $9,260 and median price of $5,500. Last year, 105 yearlings sold for $871,100, an average of $8,296 and median price of $4,500. The average sales price for yearlings this year was 11.6 percent higher than last year. The sales topper, the first...