All 12 members of the 1980 U.S. Junior Davis Cup team will play in this weekend's qualifying round for the 12th annual Washington Star International Tennis Championships.

Between 32 and 48 players will start qualifying-bracket play today at 11 a.m. at Rock Creek Tennis Stadium, 16th and Kennedy Streets NW.

Eight will advance to the first round, which begins Monday at noon. The final is Sunday, July 27.

Two-time Star champion Jimmy Connors is the No. 1 seed, with Harold Solomon, Gene Mayer, Eddie Dibbs and Jose Higueras rounding out the top five seeds in the 64-player main draw aiming for $175,000 in prize money.

Last year's champion, Guillermo Vilas, is recuperating from an appendectomy and will not defend his title. France's Yannick Noah, originally seeded fifth, withdrew from the tournament because he is still suffering a hamstring injury incurred in the French Open.

Paul Ramirez, who lost in last year's doubles final, paired with sixth-seeded Brian Gottfried, withdrew yesterday for personal reasons.

Among the Junior Davis Cup team members attempting to qualify will be Clemson University's No. 1 player, Mike Gandolfo. The 21-year-old lefthander won the Atlantic Coast Conference title in 1979 and '80.

Gandolfo's teammate at Clemson Mark Dickson, was the 1980 No. 2 singles champ and is currently ranked 25th among the nation's collegiate players.

Four of the world's top 10 pros are entered here.

John Harris, tournament cochairman with Donald Dell, called the field, "Super, the best we've had in years. We have some outstanding claycourt players, each of whom is a real threat to knock off someone like Connors in this tournament."

The only seeded players who have tested Connors recently are Dibbs and last year's finalist, Victor Pecci.

Pecci, seeded ninth, lost a dramatic championship match to Vilas last year when he slumped to the court from heat exhaustion.