A word of warning to anyone venturing to Homewood Field in Baltimore today to see three-time defending NCAA lacrosse champion Johns Hopkins play Maryland at 4 p.m. in a first-round game of the 1981 championship tournament: don't expect anything resembling exciting lacrosse.

A method to stop top-seeded Hopkins (11-0) has not yet been found this season.In fact, Hopkins has lost just once (to Virginia last season) in its last 46 outings. Dino Mattessich, coach of No. 8 Maryland (9-4), knows a normal effect will not be enough.

Mattessich ordered a stall when Hopkins defeated the Terps, 12-8, at Byrd Stadium earlier this year. Because of the tactic, the Terps' eighth straight loss to the Blue Jays was a one-goal game until 10:34 of the third quarter.

Hopkins Coach Henry Ciccarone does not fear a Maryland stall. If Howard Offit can do a good job on faceoffs (he is winning 63 percent of them), Jeff Cook (44 goals), Brendan Schneck (27) and Jeff Harris (19) will find a way to score.

In other first-round games today, No. 6 Navy (6-4) will be at West Point (6 p.m.) seeking revenge for a 9-8 regular season loss to No. 3 Army (10-3). No. 5 Virginia (8-3) hosts high-scoring No. 4 Massachusetts (13-1) at 3:30 p.m., and No. 2 North Carolina (9-0) should have little trouble with No. 7 Syracuse (7-3) in Chapel Hill.