PRAGUE, JUNE 23 -- Sergei Bubka of the Soviet Union broke his own world record in the pole vault today with an effort of 19 feet 9 1/4 inches at an international track and field meet.

Bubka's brother, Vasili, was second in the competition at 18-4 1/2 and another Soviet athlete, Grigori Yegorov, finished third at 17-8 1/2.

Bubka set the previous record of 19-8 1/2 at the Goodwill Games in Moscow on July 8, 1986. He broke the record today on his third attempt in a meet held in cold and rainy weather, according to the Czechoslovak news agency CTK.

"The rain, due to which the competition had to be interrupted several times, made the conditions very difficult today," Bubka said after the meet ended late in the evening.

The absence of outstanding competitors from other countries and the weather resulted in -- outside of Bubka's effort -- generally mediocre times and distances.

Athletes from 25 countries took part in the competition, but those from East Germany and Cuba dominated it.

Alberto Cova of Italy and Elly van Hulst of the Netherlands were the only winners from western countries. Cova won the men's 3,000 meters in 7 minutes 53.98 seconds and van Hulst took the women's 1,500 in 4:12.26.