ALTOONA, Iowa – Jockey David Mello, who was injured last Saturday in the paddock when the gelding Aksel G T flipped over on him, underwent reconstructive surgery on his broken pelvis on Monday in Des Moines. According to his wife, Stephanie Mello, "David's surgery was successful, and he has already begun physical therapy." Mello, a 29-year-old native of Foster, R.I., won a record 100 races during the 2014 Thoroughbred meet here and was off to a promising 6-for-26 start after three cards. His agent, Brian Assmann, said, "We'll hope for a speedy recovery, and I'll look forward to getting him back."