Enrique Romo became the first American League relief pitcher to win 10 games this season Sunday night as the Seattle Mariners won their second straight game from the New York Yankees.

A seventh-inning single by Bob Robertson gave Seattle and Romo a 5-4 triumph, dropping the Yankees into third place in the American League East, 8 1/2 games behind first-place Boston.

"It was good to see Romo back in form," Seattle Manager Darrell Johnson said. "He hasn't thrown that well for two or three weeks." Romo has lost four games.

The only hit in Romo's 22-23 innings was a ninth-inning pop fly double by Lou Piniella that fell among three embarrassed Seattle fielders.

The Yankee dressing room was morgue-like.

"We needed the win and just didn't get it and there isn't much more to say," New York Manager Bob Lemon said.

Yankee ace Ron Guidry started in quest of his 18th win but departed "sick to his stomach," after five innings with a 3-2 lead. His successor, Rich Gossage, couldn't hold the lead and fell to 8-10.

New York built a 3-0 lead against starter Rick Honeycutt ovr four innings, but the Mariners came back with two in the fifth. Lee Stanton led off with the only walk issued by Guildry and scored on Ruppert Jones' double. Jones scored when Willie Randolph booted Bill Stein's grounder.

The Mariners tied it in the sixth when Tom paciorek walkedhe Mariners tied it in the sixth when Tom Paciorek walkedall.

Graig Nettles made a bid for the game's top heroics with a lead-off seventh-inning homer, his 19th, to put the Yanks on top, 4-3.

It was Nettles' 34th birthday and his wife had given birth to their fourth child earlier in the day.

But Bob Stinson led off Seatles's half of the inning with a double, was sacrificed to third and scored on Craig Reynolds' single. Roberts walked and then Robertson delivered his game-winner, scoring Reynolds with a single to left field.