Sergei Bubka of the Soviet Union broke his own world record for the pole vault Saturday by clearing 20 feet, 1 inch.

Bubka bettered his record of 20-01/2 set last Tuesday in his hometown of Donetsk, U.S.S.R. It was the third time he broke the record this season and his 24th mark, indoors or outdoors. He is the only 20-foot vaulter.