The eighth-ranked Lambert stuck Szymanski in 1 minute, 50 seconds for his fifth pin of the season as No. 7 Nebraska (7-0) added two more bonus-point wins en route to taking eight of the 10 matches.
Husker All-Americans Eric Montoya (133) and TJ Dudley (184) added the other bonus-point victories. Montoya, ranked fourth, took a 14-2 major decision against Tyrone Klump to follow Lambert's pin and Dudley, ranked third, added an 18-1 technical fall win over Elijah Kerr-Brown.
Collin Purinton (149), No. 5 Tyler Berger (157) and Dustin Williams (165) ran off three straight decisions to build a 19-3 NU lead through six matches.