Oklahoma State's Joe Dial, who broke the U.S. pole-vaulting record last week, yesterday added an inch to the mark when he cleared 19 feet 2 1/2 at the Oklahoma Invitational track meet in Norman, Okla.

Dial, 22, had set the U.S. record at 19-1 1/2 at the Big Eight Conference track meet.

Dial, who thought he was jumping at 19-2, missed twice before clearing the record. He tried, unsuccessfully, to clear 19-4 3/8.

Dial's vault is the third best in the world behind world record-holder Sergy Bubka of the Soviet Union (19-5 3/4) and Thierry Vigneron of France (19-4 3/4).

"From now on, I'm going for the world record, not the American record anymore," he said . . .

The Maryland men's tennis team won the National Invitation Tournament in Orlando, Fla., upsetting top-seeded Northeast Louisiana, 5-2. The No. 6 Terrapins beat Tennessee, 5-4, Friday, and second-seeded Texas Christian, 5-2, Saturday . . .

Montgomery College sophomore Kelly Jackson earned honorable mention all-America honors this weekend by placing fifth in the 100- (12.17 seconds) and 200-meters (25.10) in the National Junior College Athletic Association meet in Odessa, Tex.