The Pittsburgh Pirates, behind the three hit pitching of Steve Blass, moved back into World Series contention with a 5-1 victory over the powerful Baltimore Orioles.

The loss ended an Oriole 16-game winning streak extending through the last 11 games of the regular season, the American League playoffs, and the first two Series contests.

Blass, a 29 year old right hander, kept the Orioles tethered with no-hit pitching through the fifth inning while the Bucs nabbed losing pitcher Mike Cuellar, one of Baltimore's four 20-game winners, for seven hits capped by Bob Robertson's three run homer in the bottom of the seventh. Robertson had been given the bunt sign on a 1-1 count and two on but missed the signal and hit a blast over the 385 mark in right field.

The Pirates' Dave Cash scored in the first and Jose Pagan drove in a run in the sixth to account for the other two Pittsburgh tallies. Frank Robinson's eighth World Series homerun in the seventh was the Orioles' only advance past first base all day.

In today's game, Baltimore's Pat Dobson will face Luke Walker (10-8) at Three Rivers Stadium in Pittsburgh.