Serena loses in first round at Miami Open

Serena Williams lost in the first round of the Miami Open on Wednesday, still rusty in her return from pregnancy and unable to overcome a tough draw against Naomi Osaka, who won 6-3, 6-2. The 20-year-old Osaka, who earned her first career title Sunday at Indian Wells, Calif., showed no signs of letup and overpowered the erratic Williams. Osaka had the stronger serve, and in rallies wore down Williams working her from side to side. Osaka is ranked a careerbest 22nd, while Williams’ ranking is 491st after her layoff of more than a year. Williams has endured a first-round defeat only four other times, most recently at the 2012 French Open. The latest loss came at a tournament she has won a record eight times and considers her home event.