Hayley Peirsol won the 1,500-meter freestyle, and Chip Peterson won the 800 free on opening night of the Santa Clara Grand Prix swimming meet Thursday.

Peirsol, the 21-year-old younger sister of Olympic backstroke champion Aaron Peirsol, swam the non-Olympic event in 16 minutes, 12.08 seconds. She finished well ahead of Club Wolverine teammate Emily Brunemann, who was timed in 16:31.55.

Whitney Sprague of North Carolina was third.

Peterson, the 19-year-old Pan Pacific open water champion from North Carolina, won the 800 in 8:02.59.

Kane Radford of New Zealand was second in 8:11.25 and Joey Pedraza was third.

Olympians Michael Phelps, Brendan Hansen, Ryan Lochte and Natalie Coughlin are among those competing in the four-day meet.