Macario, who scored a 35-yard free kick against Oregon on Oct. 19, stepped up and planted a curled shot into the top corner. It was her team-leading 13th goal of the season, and essentially put the game out of reach for USC.

Macario's goal in the 63rd minute sealed three points for Stanford, which won its 15th consecutive match and 17th straight in Pac-12 play. Andi Sullivan made a long run toward the Trojans' (14-2-1, 8-1-1) penalty area, winning a free kick from 25 yards.

No. 1 Stanford clinched its third consecutive Pac-12 championship with a 3-1 win at No. 5 USC on Sunday afternoon at McAlister Field.

Kiara Pickett and Caterina Macario also scored for the Cardinal (17-1, 10-0), which hosts California in the regular-season finale Friday night at 7 p.m.

Michelle Xiao scored in the 26th minute to snap a tie and help give the top-ranked Stanford women's soccer team a 3-1 victory over host USC Sunday, clinching the Pac-12 Conference title.

The Pac-12 championship was Stanford's third in a row, 12th all-time and seventh under head coach Paul Ratcliffe, now in his 15th season in charge of the program. The Cardinal finished the game outshooting the Trojans 18-14, including a 10-2 advantage in shots on goal.

Civana Kuhlmann forced a fingertip save in the 43rd minute before Stanford entered halftime with a 3-1 advantage. After the break, both teams had scoring chances to start the period but it was Macario who put the game to bed with her free kick in the 63rd minute.

Pickett opened the scoring in the 15th minute, heading home her first career goal after Jaye Boissiere's ball into the box. USC equalized one minute later, but the stalemate lasted 10 minutes before Xiao's goal in the 27th minute. Xiao collected the ball from Macario on the left wing, beat her marker and chipped the keeper into the far corner.

Freshman Ben Hallock scored a goal to continue his streak of at least one score in all 18 matches this season. Blake Parrish, Sacred Heart Prep grad Harrison Enright and Sam Pfeil also contributed a goal for the Cardinal in Sunday's win.

UC Irvine got within one score, before the Cardinal responded with a three-goal run to stretch its advantage to 7-3.

Chase scored a pair of goals within 25 seconds of each other to erase a two-goal deficit and tie it with six minutes remaining in the half. In all, Stanford scored four unanswered goals to take a 4-2 advantage at the half.

Seniors Connor Stapleton and Cody Smith each added a pair of goals for the Cardinal (15-3), which hosts No. 3 UCLA at 12:30 p.m. Saturday.

Stanford collected 94 points to earn the title of the Nickerson Trophy at Mystic Lake on the campus of Tufts University Sunday.

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Cardinal corner: Stanford women nab Pac-12 soccer title