USC QUOTES | UCLA QUOTES | BOX SCORE | NOTES

LAS VEGAS (AP) — Bennie Boatwright scored 19 points, Jordan McLaughlin added 18 and Southern California beat rival UCLA for the third time this season, rolling over the Bruins 95-71 on Wednesday night in the opening round of the Pac-12 Tournament.

USC (21-11) raced away from the Bruins from the opening tip, shooting its way to a 19-point halftime lead and into Thursday's quarterfinals against No. 2 seed Utah.

Boatwright hit 5-of-9 from 3-point range and the seventh-seeded Trojans went 11 for 23 beyond the arc to win three straight games over the Bruins in the same season for the first time since 1942. USC had not beaten UCLA three times in a season since going 3-1 in 1954.

Nikola Jovanovic had 16 points, and Chimezie Metu finished with 10 points and 11 rebounds for the fifth-seeded Trojans.

Thomas Welsh had 12 points to lead the 10th-seeded Bruins (15-17), who were outrebounded 52-29.

[Related: USC's Metu welcomes Bruins to the dunk party]

USC appeared to be in decent shape for the NCAA Tournament before limping to the finish with six losses in its final eight regular-season games.

UCLA was left with one option to play in the NCAAs: Win the Pac-12 Tournament.

The Bruins went into a tailspin late in the Pac-12 season, losing their final four games and nine of 12.

USC raced out to the lead in the rivals' third meeting, scoring the first 11 points and stretching the lead to 48-29 by halftime.

[Related video: Andy Enfield talks about Trojans' momentum after Pac-12 tourney win]

The Trojans did most of their damage from behind the 3-point arc, hitting 8-of-15 while shooting 47 percent overall. Julian Jacobs fueled their offense, scoring 11 points while dishing out seven assists in the first half.

UCLA started slow and never really recovered. The Bruins made 10 of 34 shots, 1-of-7 from 3-point range and Bryce Alford, their floor leader, had two points on 0-for-5 shooting and no assists before intermission.

Little changed in the second half.

[Related video: USC's Metu after win over UCLA: 'I just kept rolling to the basket, my teammates found me']

UCLA shot a little better and USC a little worse, but the Trojans' lead was never challenged.

USC faces No. 12 Utah in the quarterfinals on Thursday.