Left-hand batting first baseman Greg Walker yesterday declined to accept an assignment from the Baltimore Orioles to Class AAA Rochester, and has left the club.

His waiver period expires today, at which time the Orioles will make a move to fill his place on the roster.

Sam Horn, also a left-hand batting first baseman, appears the likely candidate for promotion. He was named International League player of the week for batting .500 (10 for 20) with 4 home runs, 2 doubles and 12 runs batted in.

In his last nine games, Horn is batting .559 (19 for 34) with eight home runs and 22 RBI, going into last night's game in Nashville.

He accepted an assignment to Rochester on June 3 as part of the move that brought Walker to the Orioles. In two stints with the Red Wings, Horn played 16 games and batted .434 with eight homers and 25 RBI.

As a member of the Orioles this season, he has played in 23 games and batted .253 with three homers and 12 RBI. He hit a pair of three-run homers on opening day in Kansas City. At the time of his assignment to Rochester he was four for his previous 23 at-bats.

Walker, 30, was in a one-for-21 slump that dropped his average in 16 games to .154 with no extra-base hits and two RBI. In his last appearance, in the eighth inning of Sunday's 4-3 loss to Minnesota, he struck out with two runners on.