OAKLAND, OCT. 8 -- The Boston Red Sox spent their weekend doing everything from clawing to stalling in this American League Championship Series, yet not until today did their labors inflict any bad news on the Oakland Athletics, who this afternoon found out they would be without shortstop Walt Weiss for the rest of the series.

The A's crafted a 2-0 advantage in this best-of-seven affair with Sunday's 4-1 victory on a long, torturous night at Fenway Park and will resume their quest for a third straight World Series appearance -- and second consecutive championship -- in Tuesday afternoon's Game 3 at the Oakland-Alameda County Coliseum.

Weiss left Game 2 after Ellis Burks upended him as Weiss tried to complete an eighth-inning double play, and tests today revealed a sprained medial collateral ligament in his left knee that will sideline him at least for the rest of the series.

A's officials are hopeful he can play by the start of the World Series. "I'll limp out there whenever they'll let me," he said after hobbling into the clubhouse this afternoon.

"We'll miss him," said A's Manager Tony La Russa, adding that he'll duplicate Sunday's maneuver of shifting Mike Gallego from second base to shortstop and inserting Willie Randolph at second. "We've done all right without him before {when Weiss missed 65 games last year with an injury to his right knee}, but it's not fun."

La Russa said he also plans to get not-yet-used outfielder Dave Henderson into his Game 3 lineup. Henderson was to start Game 2 but aggravated a sore knee chasing fly balls during batting practice Saturday.

Jose Canseco too is ailing -- having played Sunday despite a sore thumb, the result of an awkward batting-practice swing -- but both are expected to be ready Tuesday.

"We're ready to go on all cylinders," Canseco said. "We wrapped up the division title early enough to have time to rest all of our little aches and pains for the playoffs. We'll do the same thing with the playoffs and have time to rest for the World Series.

"I don't like to see {the Red Sox} suffer. We'll have to make sure to end their pain in two more days. Don't say we're not thoughtful."

Both clubs arrived here early this morning after all-night flights from Boston, and both conducted optional workouts this afternoon. Tuesday offers the Red Sox perhaps their most favorable pitching matchup of the series, with Mike Boddicker scheduled to oppose Oakland's Mike Moore.

The Red Sox today tried to avoid an appearance of resignation, but their plight seems inescapable. The A's, apparently intent on substantiating Canseco's recent claim that they are one of the finest teams ever assembled, certainly are not squandering types.

They have won eight consecutive postseason games, and Boston has tied a playoff record with six straight championship series losses -- including a four-game sweep by the A's in 1988. Oakland's victory Sunday was its 10th in its last 11 ALCS games. For Boston, the defeat came in similar fashion to Saturday's 9-1 decision.

As in the first game, the A's were shut down by Boston's starter. This time, instead of ace Roger Clemens, it was rookie Dana Kiecker, 29, who stymied Oakland until tiring in the middle innings.

The underwhelming right-hander from Sleepy Eye, Minn. -- a neighbor of A's catcher Terry Steinbach -- yielded six hits and one run in 5 2/3 innings. He left with a 1-1 tie created by Carlos Quintana's third-inning sacrifice fly and Oakland's fourth-inning response on Willie McGee's double and Harold Baines's single.

But again the Red Sox' bullpen faltered. Greg Harris and Larry Andersen yielded the go-ahead run in the seventh on two singles and Baines's bases-loaded groundout. Even stopper Jeff Reardon did not escape unscathed, as the A's reached him for two ninth-inning runs.

Over the two games, Clemens and Kiecker worked to a 0.77 ERA in 11 2/3 innings, but Red Sox relievers gave up 12 runs in 7 1/3 innings for a 14.73 ERA.

"Once we get past their starters," A's left fielder Rickey Henderson said, "we feel that if we keep attacking we're definitely going to break through."

Boston may be short-handed in the bullpen now, with Dennis Lamp's back injury leaving him questionable.

"It's easy to point fingers at the bullpen, but no one has done the job," Red Sox third baseman Wade Boggs said. "We only have two runs in two games."

Boston is zero for 13 with men in scoring position, and A's closer Dennis Eckersley has finished both games. Red Sox Manager Joe Morgan is toying with the uncomfortable prospect of bringing Clemens back for a Game 4 start on three days' rest.