National record holder and gifted quarter-miler Sada Williams will be chasing a season’s best when she competes in the women’s 400 metres at the Barbados National Championship in Athletics, scheduled to run off at 6:57 p.m. today at the Usain Bolt Sports Complex. Williams was unmatched during the one-lap preliminary race on the opening day of nationals Friday, clocking a breezy 52.42 seconds to advance to the final. She was …