Key league match-ups among Top 25 teams this week

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   LAGUNA NIGUEL – League play comes to the forefront in Southern California high school basketball this week.

   And, relative to the CIF Southern Section’s prospect eight-team Open Division playoff field, that’s most notable relative to the four strongest leagues in the section: The Baseline, Ivy, Mission and Trinity.

    In key matchups this week:

   *Baseline: Damien (No. 9 in the BurlisonOnBasketball updated Southern California Top 25) plays at No. 10 Chino Hills Friday night;

  *Ivy: No. 15 Riverside Notre Dame plays host to No. 11 Rancho Verde on Tuesday night and visits No. 20 Riverside Poly Thursday night;

  *Mission: No. 17 Loyola – on an 11-game winning streak – is at No. 19 Sherman Oaks Notre Dame Wednesday night and No. 16 Harvard-Westlake on Friday night;

  *Trinity: No. 6 Mater Dei plays host to JSerra and No. 15 Santa Margarita is at No. 13 St. John Bosco Wednesday night; and No. 12 Orange Lutheran is at Santa Margarita Friday night.

  No.’s 1 Sierra Canyon, 2 Rancho Christian and 5 Fairfax will play host to “one-day events” on Saturday, with the Fairfax affair subject to change if the L.A. Unified School District suffers a strike from its teachers’ union this week.

  Here’s the updated BurlisonOnBasketball Top 25:

(With CIF section and record, thru games of Jan. 5)

1. Chatsworth Sierra Canyon (Southern Section/18-1)
2. Temecula Rancho Christian (SS/14-1)
3. Westchester (LAC/15-1)
4. Corona Centennial (SS/15-3)
5. Fairfax (L.A. City/14-1)
6. Santa Ana Mater Dei (SS/18-1)
7. Torrance Bishop Montgomery (SS/15-4)
8. Etiwanda (SS/15-2)
9. La Verne Damien (SS/14-2)
10. Chino Hills (SS/8-5)
11. Moreno Valley Rancho Verde (SS/14-4)
12. Orange Lutheran (SS/16-4)
13. Bellflower St. John Bosco (SS/16-4)
14. Riverside Notre Dame (SS/13-6)
15. RSM Santa Margarita (SS/13-5)
16. Studio City Harvard-Westlake (SS/13-4)
17. Loyola (SS/16-4)
18. Long Beach Poly (SS/12-4)
19. Sherman Oaks Notre Dame (SS/12-8)
20. Riverside Poly (SS/13-6)
21. Brentwood (SS/12-1)
22. Washington Prep (LAC/11-5)
23. Windward (SS/13-3)
24. Camarillo (SS/15-3)
25. St. Augustine (San Diego Section/13-4)

New: St. Augustine

Dropped: Mission Bay