The Maryland football team continued to practice against two different defenses yeserday because the Terps have no idea what king of look to expect Saturday from Vanderbilt.

The Commodores played both a 5-2 and a 4-3 defense last season and, although Coach Jerry Claiborne thinks it likely they will play the 5-2, he has his team running plays against both types, just in case. Saturday is Vanderbilt's opener, so they have yet to tip their hand. The Terps opened last week with a sloppy 7-3 win over Villanova.

Eric Sievers' ankle has improved considerably this week and the senior tight end should be ready to play at close to 100 percent Saturday; the same cannot be said for middle guard Marlin Van Horn, whose ankle still continues to bother him . . . all-America placekicker Dale Castro, who missed two field goals Saturday while hobbled by a groin pull, was his old self in practice Wednesday. With the entire team standing around and yelling to break his concentration, Castro nailed three straight field goals from outside the 40-yard line.

Sophomore quarterback Boomer Esiason, afflicted by a knee injury recently, will sit out this season as a red shirt unless disaster strikes the top three quarterbacks . . . Another likely red shirt is sophomore defensive back Jonathan Simmons, from Baltimore.

Basketball note: David Henderson, 6-foot-9 front-court reserve who is in his last year in Maryland's five-year engineering program, has elected to pass up his final year of eligibility in order to concentrate on his studies. Henderson is an honor student.