RIO DE JANEIRO — The most dominant American track event at these Summer Games looks ready for a sweep of the medal podium.
Kristin Castlin, Nia Ali and Brianna Rollins advanced through the opening round of the women’s 100-meter hurdles with room to spare, each winning their respective heats to move into Wednesday’s semifinals.
Overall, Rollins finished first among all hurdlers (with a time of 12.54 seconds), Castlin finished second (12.68) and Ali finished sixth (12.76).
Rollins’ heat illuminated the gap between the USA and its competition. Her time was .27 seconds ahead of the second-place finisher Megan Simmonds of Jamaic (12.