USC guard JuJu Watkins, right, drives as Cal State Northridge guard Erika Aspajo defends during the second half Tuesday night at the Galen Center. (AP Photo/Ryan Sun)

USC guard JuJu Watkins reacts during the first half of the game against Cal State Northridge Tuesday night at the Galen Center. (AP Photo/Ryan Sun)

Cal State Northridge guard Morgan Edwards, left, has the ball stripped by USC guard JuJu Watkins during the first half Tuesday night at the Galen Center. (AP Photo/Ryan Sun)

Cal State Northridge forward Nnenna Orji, center, is defended by USC center Clarice Akunwafo, left, and guard Talia von Oelhoffen during the first half Tuesday night at the Galen Center. (AP Photo/Ryan Sun)

USC head coach Lindsay Gottlieb reacts on the sideline during the first half of the game against Cal State Northridge on Tuesday night at the Galen Center. (AP Photo/Ryan Sun)

Cal State Northridge guard Erica Adams, center, drives against USC guard Avery Howell, left, and center Rayah Marshall during the first half Tuesday night at the Galen Center. (AP Photo/Ryan Sun)

Cal State Northridge head coach Angie Ned reacts on the sideline during the first half of their game against USC on Tuesday night at the Galen Center. (AP Photo/Ryan Sun)

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USC guard JuJu Watkins, right, drives as Cal State Northridge guard Erika Aspajo defends during the second half Tuesday night at the Galen Center. (AP Photo/Ryan Sun)

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LOS ANGELES — A bad mismatch produced a predictable result and a milestone for USC women’s basketball coach Lindsay Gottlieb.

JuJu Watkins had 21 points, nine assists and six steals as third-ranked USC beat Cal State Northridge 124-39 on Tuesday night at the Galen Center, giving Gottlieb his 300th career win.

The Trojans (3-0) had six players score in double figures, including Kiki Iriafen with 15 points and Kayleigh Heckel with 14 points off the bench. All 13 Trojans who played scored as the team set a single-game program record for points total.

Gottlieb’s players waved “300” signs after the game and jumped up and down around her.

USC essentially won the game from the opening tip. The Trojans outscored the Matadors 30-6 in the first quarter and then allowed just seven points in the second quarter to lead 60-13 at halftime.

The Matadors committed 43 turnovers, which led to 63 points for the Trojans. Erica Adams had 10 turnovers and Nnenna Orji had seven.

After earning a two-point victory over then-No. 20 Mississippi in Paris to open the season, the Trojans blew out their second straight opponent after beating Cal Poly (SLO) by 55 points last week. Their road gets a lot tougher later this month when they visit No. 1 Notre Dame. 6.