Seventh-ranked Wootton is the surprise favorite in the Maryland 4A West region tournament. (Toni L. Sandys/THE WASHINGTON POST)

All eight games in the first round of the Virginia AAA Northern Region field hockey tournament Tuesday were decided by shutout, five by 1-0 scores.

Herndon, one of three Concorde District teams to advance, slipped past Yorktown, 1-0. The Hornets scored with about five minutes left when sophomore Taylor Stone assisted senior Megan Janowski on the game’s lone goal.

West Springfield edged Marshall, 1-0, on an unassisted goal by sophomore Brittan Muir, who earlier in the game had made a key defensive save on a corner.

Toward the end of the first half of McLean’s 1-0 win over T.C. Williams, senior Sofie Andreoli scored off a corner with an assist from senior Kat Mulligan.

Mount Vernon, the only National District team to advance, has reached the second round of regionals for the first time since 2007 thanks to a 1-0 win over Chantilly. Senior Lizzy Sagar scored off an assist from senior Jane Heller with about 12 minutes left on one of the Majors’ 11 corners (to Chantilly’s three).

Fairfax sophomore Charlotte Duke scored late in the first half for the Rebels’ 1-0 win over Lake Braddock, marking the second time in four years that Fairfax has bounced the Bruins in the first round.

The quarterfinals — Oakton at South County, Herndon at Fairfax, West Springfield at Mount Vernon and McLean at Westfield — all are rematches from the regular season won by the home (higher-seeded) quarterfinal teams. All are scheduled for 7 p.m. Thursday except for West Springfield-Mount Vernon, which will be played at 7 p.m. Friday because of a field conflict.

All of those regular season encounters between the quarterfinal opponents were determined by at least two goals, although in addition to losing 2-0 to West Springfield, Mount Vernon tied the Spartans in another game.

Postseason gets underway in Maryland

The first full day of the Maryland state tournaments is scheduled for Thursday, and several intriguing matchups potentially loom for Monday’s region semifinals should the favorites win Thursday – especially in the state’s biggest classification.

The 4A East region – with No. 1 South River, No. 4 Broadneck and No. 5 Severna Park – is always the toughest, which makes Severna Park’s five straight titles since it joined the region in 2007 all the more impressive.

South River would host Broadneck in one region semifinal Monday, and the winner of that game would host Severna Park in the region final Wednesday, should the Falcons survive their probable region semifinal trip to undefeated Southern Maryland Athletic Conference champion Leonardtown.

Severna Park is 8-0 against South River and Broadneck in postseason games since 2007.

No. 7 Wootton is the surprise favorite in the 4A West region that 13-time state champion Bethesda-Chevy Chase won last year.

The Barons – whom Wootton would likely face in the region semifinals – have struggled with injuries and inconsistent play this season, opening up a chance for the top-seeded Patriots to vie for their first state tournament appearance since 2007, and for No. 2 seed Walter Johnson to aim for its first region title since 2001.

Montgomery County’s other surprise this season has been No. 8 Sherwood, the top seed in the 4A South region.

The Warriors could potentially face a Whitman squad that played them tough last month in a region semifinal game.

The Post Top 10

South River and Broadneck are on track to play Monday in a Maryland 4A East semifinal, while Severna Park looms on the other side of the region’s bracket...Wootton and Sherwood are the top seeds in the Maryland 4A West region and 4A South region, respectively... With two more wins by each team, Westfield and Fairfax would meet in the Virginia AAA Northern Region final on Nov. 1.

(Records through Tuesday)

1. South River (12-1-1) Last week: 1

2. Glenelg (13-1) LW: 2

3. Westfield (17-2) LW: 3

4. Broadneck (11-3) LW: 5

5. Severna Park (10-3) LW: 4

6. Bullis (14-0) LW: 6

7. Wootton (11-0-1) LW: 7

8. Sherwood (14-0) LW: 8

9. Fairfax (18-1) LW: 9

10. St. Stephen’s/St. Agnes (13-4-1) LW: 10