Medina Dixon, the "other" all-America center from Cambridge (Mass.) Rindge and Latin High School, put on an extraordinary show in the first McDonald's Girls Classic yesterday, leading the East Coast All-Stars at St. John's High School.

Dixon, a strong, mobil 6-foot-1 senior from the high school that produced 7-foot Pat Ewing, was the most impressive of the 13 all-Americas on the two teams. Finishing with 20 points, 14 rebounds, four assists and two steals, she was the overwhelming choice as the game's most valuable player. t

"They say that the cream rises to the top," said Robyn Mayor of DuVal High School, who scored 13 points for the Metro team. "Medina is something else. She's really strong and hits the boards real well. But the whole team was like that. They beat us on the boards (52-28) something awful."

Dixon led two key rallies for the East Coast team. The first came midway through the second period, with the Metro team leading. Dixon made a turnaround jumper, then stole the ball and went the length of the floor for a layup that gave her team a 31-30 lead. The Metro team led, 41-40, at the half, but had obviously lost momentum.

In the third quarter, the East Coast team put the game away by outscoring the Metro team, 16-4, in the first six minutes. Again, Dixon led the way by scoring on a variety of inside moves and rebounding in her one-handed style. Her team outscored the Metro club, 31-11, in the third quarter for a 71-52 lead, and led by at least 11 points the rest of the game.

Debbie Young, a 6-2 center from Robinson, led the Metro team with 17 points and eight rebounds. Teammate Cathy Grimes, from T. C. Williams, had 13 points and 11 rebounds in the first half. Both are headed for Virginia.

Two highly touted players had frustrating games. Karen Elsner, a 6-2 center from Holy Cross and a first-team Parade all-America, had only seven points and appeared lost under the boards.

Linda Page, an all-America from Philadelphia scored 100 points in a game this year, similarly never got into the flow of the game. She finished with six points, four in the last minutes, long after the game had been decided.