Georgetown, Yale and Harvard advanced into Saturday's quarterfinals of the Ladies Challenge Plate for eights at the Henley Royal Regatta today.

The Santa Clara, Calif., team lost to Isis Boat Club of Oxford University, Georgetown's foe Saturday at 12:20 p.m. (7:20 a.m. EDT).

Georgetown defeated Britain's Reading University by 2 3/4 lengths, but Coach Jay Forster warned, "Tomorrow we have to row better. Isis is a better crew than Reading, no doubt about that.

"We had a good start. We have to maintain a higher stroke for a little longer. The past records of Isis in this regatta show they rowed at a high beat in order to break the spirit of the competition early. So we're going to do our best to stay right with them at the start and continue to push them all the way through the entire race."

Georgetown's time against Reading was 6:51 over the 2,100-meter course. The Hoyas took a slight lead at the outset and steadily increased it. Reading drew within a length with a just over a half-mile remaining, but then Georgetown sprinted to the finish and won easily.

Yale's junior team beat University College of Dublin by three-quarters of a length.

Harvard's junior team won by more than two lengths against Kings College of London.

The Santa Clara Rowing Association, which won the right to attend Henley by beating the University of Washington--last year's Ladies Challenge Plate winner--was outpowered by Isis and is out of the competition.

Harvard's second team of coxed fours, entered in the Visitor's Challenge Cup, was beaten by Britain's Durham University. That leaves only Yale's coxed four to represent the United States.