Steve Meister and David Carter, partners in doubles and drafts, defeated the top two seeds yesterday in the singles semifinals of the Toyota/Century 21 men's invitational championship in Annandale.

Meister used a hard, flat serve and a soft touch at the net to upset top-seeded Terry Moor, 6-0, 6-3. "He rolled over; I couldn't believe it," said Meister, 25, from Miami.

Carter also displayed a fast, accurate serve and deft passing shots in beating No. 2 seed Van Winitsky, 6-2, 6-3.

"The key factor was my serve and passing," said Carter, 27.

In the first match of the day, Meister mixed three aces with nine winners and forced 12 errors from his serve to defeat the erratic Moor, who struggled in the heat. "I felt kind of dizzy," Moor stated. "I just couldn't get going."

Moor, ranked 45th in the world at the beginning of 1983, won segment two of the USTA Satellite Circuit nevertheless. The circuit consists of five segments, with each segment comprising five tournaments.

During one stretch, Meister won 11 straight points with his 110-mph serve. His drop shots and net play kept Moor off balance and off his serve-and-volley game.

"I know I have to come to net to win," the fourth-seeded Meister said. "It's difficult for me to stay back and win points."

Winitsky also seemed tight; he constantly changed rackets to delay the match, hoping to find the right rhythm on the hard court, after four weeks of clay tournaments.

"It takes me a couple of weeks to get used to hard courts after clay," he said.

Winitsky made 11 unforced errors and lost six more to Carter's serve. Carter, an Australian, was brilliant from the base line, hitting 13 outright winners and consistently passing Winitsky.

"It was hot out there, but we played quick points," Carter said.

Meister gave his friend a high-five. "We're going to have fun tomorrow," Carter said.

"Let's go have a few beers now," Meister replied. "Oh yeah, we can't. We have to play doubles."

"Why did we do that (sign up)?" Carter asked.

"I don't know," Meister said, laughing. And then the two, who are 1-1 against each other on the circuit, walked off, thinking neither about their semifinals doubles match nor the 2 p.m. championship today.