Chun posted the top time in the country in the 400-yard I.M. (4:51.22) at the Malibu Invite hosted by Pepperdine.
Lashley swam a career-best in-season time in the 200 fly (2:02.60), placing 10th, and also finished 11th in the 100 fly (53.58), a good time for this early in the season that puts him on track to perform well at the NCAAs.
Both Oxy squads were also recognized. The Oxy men are No. 18 and the women are No. 19 in the collegeswimming.com national rankings.
"It's good for not only Austin and Laura to be recognized, but also both programs," Oxy head coach Steve Webb said. "We're excited to get some recognition and looking forward to continuing to improve."
Next Meet: The Tigers have their alumni swim meet on Oct. 23 at 2 p.m.