T.C. Williams expected to meet another unbeaten team tomorrow night in Edison, but West Springfield ruined that scenario with a 15-14 upset win over Edison. Meanwhile, T.C. Williams had little trouble in handing Madison its first loss. Surprising Yorktown and defending Northern Region champion Marshall both remained undefeated in the Great Falls District. If Marshall defeats McLean and Yorktown escapes South Lakes, the teams will meet for undisputed possession of first place in the district next week. Football

Just three teams remain perfect in the Northern Region as two matchups involving unbeatens and one upset cut the number in half last weekend. Edison (3-1) was upset by West Springfield, 15-14, while Yorktown and Marshall handed Herndon and South Lakes their first losses of the season. One private school, Bishop Ireton, ran its record to 4-0 with a win over St. Stephens.

T.C. Williams (3-0), the area's top ranked team, rolled to a 28-0 win over Madison. Lydell Scott ran for over 100 yards for the third straight game and the Titan defense held Madison (2-1) to just 98 total yards.

Yorktown (4-0) continued to surprise the rest of the region with a 14-0 blanking of Herndon. Greg Graham ran for 80 yards and two touchdowns to increase his season totals to 389 and five, respectively.

Marshall rushed for 272 yards, 204 coming in the second half as it improved to 3-0 at the expense of South Lakes (2-1), 25-7. Joe Swarm gained 131 yards to pace the attack while the defense, which has surrendered just 17 points in three games, held the Seahawks to 36 yards rushing.

Eddie Mahoney broke a number of tackles as he returned a punt 75 yards for a touchdown and also caught a pass for a two-point conversion in the closing minutes as West Springfield (1-2) defeated defending state Division II champion Edison, 15-14.

Running backs Mike Lalli and Derek Fitzgerald combined to rush for 212 yards as Ireton downed St. Stephens, 27-16. Lalli had two touchdowns in the first half as the Cardinals held a 13-9 lead. Fitzgerald added another score in the second half as they pulled away.

Robinson (2-1) rebounded from a loss to Herndon to rout West Potomac, 34-0. Tailback Mike Johnson ran for 101 yards and a touchdown while Brent Torgeson threw for 119 yards and two touchdowns.

Wakefield (3-1) won its third straight game, shutting out Falls Church, 21-0. Fullback Eric Rainey rushed for 139 yards and quarterback Randy Lyon tossed touchdown passes to Sidney Winkler and Kevin Creed.

W.T. Woodson ran its mark to 3-1 with a 14-7 win over Hayfield (0-3). William Weaver, who scored the decisive touchdown in the Cavaliers' victory over Annandale two weeks ago, returned a kickoff 95 yards for a touchdown and rushed four yards for the other score.

Oakton, which finished 9-1 a year ago, defeated McLean, 25-0, for its first win in three games. Kevin Barnes, who rushed for over 1,000 yards a year ago, gained 128 yards and a touchdown. Receiver Roland Calvert, who was the region's interception leader in 1986, caught two more touchdown passes, raising his total to four this season.

Stuart quarterback Darnell White tossed three touchdown passes, including two to Chris Recabo, but Chantilly kicker Eric Burgess kicked a 25-yard field goal in the closing minutes to give the Chargers (1-2) a 22-20 win over the Raiders (1-3). Chantilly quarterback Jeff Ryckert, sidelined most of the game with a hip pointer, came off the bench to direct the Chargers to the winning field goal.

O'Connell (3-1) needed a fourth-quarter touchdown pass by Matt Dwyer to Andy Riddle to edge Cardozo (D.C.), 27-24. Cardozo jumped out to an 18-0 lead, but for the second straight year fell victim to an O'Connell comeback.

Lake Braddock (1-2) won its first game of the season, getting two first quarter touchdowns and holding off Mount Vernon (0-3), 14-7. Fairfax evened its mark at 2-2 as Hayden Codding passed for a touchdown and ran for another in a 29-0 win over Lee (1-3).

Field Hockey

Lori McPherson scored two goals and Christy Walton and Liz Riesz combined for eight saves as Fairfax shut out Falls Church, 3-0, in a Potomac District field hockey matchup. Debbie French assisted on both McPherson goals as the Rebels improved to 3-1, 2-0 in district play.

Johanna Kushan scored Madison's lone goal to defeat Herndon 1-0 in a Great Falls District Match. Herndon, which is 1-2 in the district, defeated defending state champion McLean last week. Girls Tennis

Woodson routed Robinson, 8-1, in a battle of unbeaten teams. Michelle Kladakis of Woodson came back from 8-1 and 9-4 deficits to win the number six singles and clinch the victory for the Cavaliers.

Cross Country

Anne Evans of South Lakes won her second major invitational of the season last weekend, capturing the Pallotti Invitational with a three-mile time of 17:44 (see profile). On the boys side, Lake Braddock's Vince Hancock tied a meet record with a time of 14:48, but settled for second place behind Eleanor Roosevelt's Greg Early, who broke the meet record by six seconds.