Riverdale Baptist acsends to the No. 1 position after Paul VI suffered its first loss of the season to Good Counsel. (Jonathan Newton/The Washington Post)

1. Riverdale Baptist (19-1) Last week: 2

After a 73-36 win over Philadelphia-based Imhotep Saturday, the Crusaders have won seven straight games since their lone loss to St. Mary’s (Calif.), the nation’s No. 1 team.

2. National Christian (17-0) LW: 3

Junior Mykea Gray scored 21 points and added four rebounds and four assists in the Eagles’ 74-14 win over Arundel Saturday.

3. Paul VI (15-1) LW: 1

The Panthers’ 39-game win streak against WCAC foes ended in Thursday’s 73-71 loss to Good Counsel, but they rebounded with a 68-29 victory over Holy Cross Saturday.

4. Oakton (13-0) LW: 4

Senior Alex Marquis helped the Cougars pull away from Herndon with 17 points and seven rebounds in a Virginia Conference 5 opener between undefeated rivals Friday.

5. St. John’s (13-1) LW: 5

The Cadets moved into first place in the WCAC standings with wins over Holy Cross, St. Mary’s Ryken and Elizabeth Seton last week.

6. Forestville (9-1) LW: 6

The Knights had five players finish in double figures when they scored 90 and 93 points, respectively, in wins over Fairmont Heights and Douglass last week.

7. Old Mill (11-0) LW: 7

The Patriots scored their most impressive win to date this season by beating IAAM-A contender Roland Park, 56-54, on Saturday.

8. Good Counsel (11-2) LW: 10

The Falcons followed up their upset of then-No. 1 Paul VI with a 62-52 win over Bishop Ireton Saturday.

9. Langley (11-1) LW: 8

The Saxons won low-scoring games against Hayfield and McLean leading into a Conference 6 showdown at No. 10 Fairfax Tuesday.

10. Fairfax (12-0) LW: 9

Senior guard Noe’ll Taylor is averaging a team-high 13.3 points per game after leading the Rebels in scoring during wins over Madison and Hayfield last week.

11. Georgetown Visitation (8-3) LW: 14

The Cubs snapped a two-game skid with a 41-37 win over ISL AA rival Holy Child behind 16 points from junior forward Maeve Carroll.

12. Edison (10-2) LW: 15

Seniors Jada Graves and Megan Hendrick combined for 36 points in a 69-40 win over Marshall last Tuesday, and the Eagles then beat Wakefield two days later.

13. Battlefield (13-1) LW: 16

Senior forward Nikki Dyson racked up 11 points and 13 rebounds to lead the Bobcats to a 58-36 win over Riverbend Friday.

14. Atholton (9-0) LW: 17

The Raiders remained perfect with a 19-point win over Centennial Friday despite the absence of junior guard Fran Vanegas.

15. National Cathedral (7-1) LW: 12

After dropping a one-point loss to Flint Hill, the Eagles have a two-week layoff before a tough road game at Bullis.

16. West Springfield (8-2) LW: 11

The Spartans bounced back from a loss to South County with a 50-38 win at Mount Vernon Friday behind 17 points from senior Haley Blankinship.

17. Loudoun County (10-1) LW: 18

After cruising to wins over Rock Ridge and Heritage last week, the Raiders have now gone more than two years without losing to a local opponent.

18. Whitman (7-3) LW: 20

Sisters Abby, Livy and Emily Meyers have a combined average of 31.3 points per game for the Vikings, who beat Churchill Friday night.

19. Elizabeth Seton (10-5) LW: NR

Leading scorers Adrianne Hagood and forward Jaylen Hines each had 20 points when the Roadrunners beat then-No. 13 O’Connell last Thursday.

20. Herndon (10-1) LW: 19

Junior Indeya Sanders scored a game-high 20 points in the Hornets’ 57-44 loss to rival and No. 4 Oakton Friday.

Dropped out: No 13 O’Connell (11-4)

On the bubble: O’Connell, Chantilly (11-2), Flint Hill (8-4), Chopticon (7-2), Freedom-South Riding (8-1)

Records through Sunday.