The sixth-seed Seahawks (9-2) now advance to play at No. 3 Westfield (10-1) 7 p.m. this Friday. Westfield, a 44-20 winner over Washington-Lee, has not lost since Sept. 11 against South County.
In Friday’s game, the Cougars and Seahawks went into halftime tied at 14. After a scoreless third quarter, Oakton got the ball deep in South Lakes territory twice, where wide receiver Jarrett Bacon scored on runs of 13 and 8 yards to put Oakton up 28-14.
But South Lakes came back with three straight touchdowns, two of them by Marvin Grunchie, who two caught 15-yard passes from QB Devin Miles. Spencer Alston also scored on 2-yard run.
Grunchie finished the game with seven catches for 114 yards.
It was South Lakes’ first playoff game since 2010.