Freshman Cole Madey tied for 15th at the Pac-12 Championships.
Sophomore Tyler Collier shot a 1-under 70 on Saturday.
Senior Jonathan Garrick is tied for third, three back, after 36 holes.
The 72-hole Pac-12 Championships run from Friday through Sunday.
Harrison Mahon is a senior at Rancho Bernardo HS in San Diego.
Senior Lorens Chan posted the Bruins' best finish with a T-16.
Sophomore Tyler Collier shot an even-par 70 on Tuesday.
Jonathan Garrick made five birdies during his opening round on Monday.
The Bruins' final regular-season tournament runs Monday-Wednesday.
Senior Jonathan Garrick had the best round for the Bruins on Saturday.
Freshman Cole Madey is the top UCLA scorer at 3-over.
Lorens Chan and Cole Madey each shot a 1-over 71 on Thursday.