Chuck Ebner, a 47-year-old Baltimore mailman, eliminated seven-time champion Marty West, 2 up, in the second round of the Maryland Amateur yesterday at Congressional Country Club.

In morning first-round matches, other favored golfers fell. Defending champion Kevin Allis of Rolling Road lost to Paul Robison of Hunt Valley, 2 up. Medalist Eddie Offterdinger of Bethesda was eliminated by 1984 finalist Joe Records of Hunt Valley, 3 and 2.

Ebner handled everything Rockville's West could manage. West rallied from 3 down to even with birdies at holes 8, 10 and 13. Ebner then reached the par-5 No. 14 in two shots and birdied to go 1 up.

Ebner saved par from greenside sand to halve the 17th. At par-3 No. 18, Ebner was faced with a 50-foot chip from a sidehill lie. He hit it to within two feet for a clinching par.

"I've been putting so good over here, I felt if I could get the chip inside five or six feet, I could make it," said Ebner, who plays out of Country Club of Maryland.

Ebner will play Butch Mielke of Robin Dale in this morning's opening quarterfinal at 8, followed by Jim Estes of Bethesda against former finalist John Kyle of Congressional; Records vs. Mike Cox of Breton Bay, and Tim Moylan of Argyle vs. Eddie Johnston of Baltimore.

Johnston, a 1939 semifinalist now age 63, walked 35 holes in defeating Jim Castagna and Rich Goldman.

Jimmy Bellizzi, a Middle Atlantic PGA life member, had eight birdies in a six-under-par 65 yesterday to win the American Red Cross Pro-Am at Poolesville. It extended his record of years with at least one sectional tour victory to 22 straight.