BALTIMORE, JUNE 10 -- Rookie Ellis Burks produced two home runs and seven RBI as the Boston Red Sox pounded out 18 hits and routed the Baltimore Orioles, 15-4, before 21,748 at Memorial Stadium tonight.

Boston right-hander Al Nipper (5-5) went all the way, giving up seven hits.

In a season that has turned inside out and upside down in only a couple of weeks, the Orioles (27-31) lost for the seventh straight time and fell into sixth place.

Tonight, the Red Sox did it with an awesome bit of slugging, getting grand slams from Burks and second baseman Marty Barrett. Barrett had four hits and Spike Owen, Jim Rice and Wade Boggs three each.

Burks hit his grand slam in the fourth off Orioles starter Eric Bell and added a two-run shot off Ken Dixon in the ninth. Barrett got his off Jack O'Connor in the seventh.

Barrett also had four RBI and Rice three. Among other highlights:Tonight was the first time in 34 years the Orioles have allowed two grand slams in one game.The loss completed a three-game sweep for the Red Sox; the Orioles have been swept at home six times this season and nine times since last June. They were swept nine times in the nine years before last June.Their 9-19 home record is the worst in the American League, and they are 17-39 here since Aug. 5.

The Orioles once stood for many things, but nothing more than pitching excellence. This year, they stand mostly for pitching weakness. The 18 hits and two grand slams were only part of the story tonight; four Baltimore pitchers threw in nine walks, including five in 3 1/3 innings by Bell.

It was the 11th time this season Baltimore pitchers walked at least six. It started with Bell, who allowed six runs, and finished with Dixon, who allowed four in two innings. Dixon has given up 15 earned runs in his last 14 1/3 innings.

Lee Lacy led off the bottom of the first with his third homer, and Bell actually made it stand for an inning. But in the third, Burks drew a leadoff walk and went to second on Barrett's single, to third on Boggs' double-play grounder and home on Rice's single.

Then in the fourth, the lights went out on Bell as five of six batters reached base. The first was Dwight Evans, who led off with a walk, Bell's fifth. He went to second on Edgar Romero's groundout and stayed there as Owen beat out a single.

Marc Sullivan singled to right to load the bases. Then Bell threw Burks a fastball in the middle of the plate that turned into a grand slam and a 5-1 Boston lead.

After Barrett followed with a single, Orioles Manager Cal Ripken Sr. brought in Tony Arnold, who arrived from Rochester earlier in the day. Boggs greeted him with a single, and Rice followed with another to make it 6-1. Arnold hit Don Baylor with a pitch, then got Evans on a double-play grounder to end the inning.

The Orioles closed to 6-3 in the fifth. Ray Knight hit his sixth homer, and Mike Young tripled and scored on a groundout by Rick Burleson.

In the seventh, the Red Sox sent eight more to the plate and scored five runs to blow the game open, 11-3. Baylor and Evans began it with walks, and Romero sacrificed. Owen was intentionally walked, and when left-handed hitting Rich Gedman was sent up to pinch hit, Ripken Sr. countered with left-hander Jack O'Connor.

O'Connor got Gedman on a foul pop, but walked Burks to force in a run, the rookie's fifth RBI. O'Connor then went to a full count on Barrett before challenging him with a fastball down the middle, which turned into the second bases-loaded homer.

Orioles Notes:

An indication of the importance of a pitcher's control: Bell faced 20 hitters tonight and threw a first-pitch strike to six. On Tuesday, Dave Schmidt, who pitched six shutout innings, threw first-pitch strikes to 21 of 26 Boston hitters . . .

Ripken Sr. hinted that Dixon no longer would be used with the game on the line. That came after Dixon blew his fifth save chance Tuesday . . .

The last complete game by an Orioles starter other than Mike Boddicker was May 6, when Scott McGregor shut out the Twins in the Metrodome . . .

Baylor was hit by a pitch for the 12th time this season and the 239th of his career. He's four short of Ron Hunt's all-time major league record . . .

Young's triple was the Orioles' 12th this season. A year ago, they had 13, the fewest ever by a major league team . . .

The Red Sox are 17-2 at Memorial Stadium since Sept. 21, 1984 . . . Pitcher John Hoover, the Orioles' No. 1 draft choice in 1984, was named Southern League player of the week. He was 2-0 with a 1.20 earned run average for Class AA Charlotte . . .

Bill Buckner who injured his right hip in a collision with Jim Dwyer Monday night, returned to Boston for further examination.