SAN FRANCISCO, Calif. - Peyton Callens fired a five-under 66 in Monday's second round of the USF Invitational on the Olympic Club Lake Course, placing himself atop the individual leaderboard heading into Tuesday's final round.

Callens, at five-under (71-66=137), holds a one-stroke lead over a trio of golfers at -4, with two more two strokes back at -3. The Langton, Ontario, native's second round started with a bogey at No. 8, but from there Callens caught fire. After three-straight pars steadied the ship, Callens birdied No. 12 to get back to even, then, after three more pars, went on a run of four birdies in a row.

After a bogey at No. 2, Callens got par at No. 3, before two-straight birdies at Nos. 4 and 5 brought him to five-under.

Teammate Tom Patterson is tied for 15th at +1, firing rounds of 71 and 72 Monday.

On the team leaderboard, Nevada sits tied for fifth at +3 (287-284=571), ending the day with an even-par second round. The strong second round brought the Pack to within four strokes of leader BYU (-1), as the top six teams in the field are separated by just four strokes entering the final round.

 Connor Motherway fired rounds of 73 and 72 to finish the day at +3, while newcomer Keita Okada went 72-74 in his Nevada debut. Trey Davis rebounded from an opening-round 80 to card a 75 in the second round to round out the Wolf Pack quintet.

The first groups of Tuesday's final round tee off at 8 a.m. Callens' foursome is scheduled to tee off at 9:17 a.m., with Motherway and Patterson in the 9:28 a.m. group, and Davis and Okada teeing off with the 9:39 a.m. group.

USF Invitational Team Standings
1. BYU (278-289=567) - -1
T5. Nevada (287-284=571) - +3
T5. San Francisco (283-288=571) - +3

Nevada Individual Standings
1. Peyton Callens (71-66=137) - -5
T15. Tom Patterson (71-72=143) - +1
T23. Connor Motherway (73-72=145) - +3
T26. Keita Okada (74-72=146) - +4
T55. Trey Davis (80-75=155) - +1