ST. LOUIS — A year after a first-round flameout, the St. Louis Blues are on the verge of a rare appearance in the conference finals.

Cory Stillman scored at 9:26 of the second overtime as the Blues overcame a two-goal deficit for a 3-2 victory over Dallas, taking a 3-0 series lead Tuesday night in the Western Conference semifinals.

St. Louis needs one more victory to reach the conference finals for the first time in 15 years and can complete a sweep in Game 4 Thursday night at home. The Blues had the NHL's best regular-season home record, losing only five times.

Another loss and the Stars' drive for a third straight Stanley Cup final is history.

"They have the hammer, and we're the nail," coach Ken Hitchcock said. "St. Louis will have to beat us. We won't beat ourselves."

This series winner will play either the Los Angeles Kings or Colorado Avalanche for the West championship. The Kings, who trail that series 2-1, welcome the Avalanche for Wednesday's fourth game.

St. Louis outshot the Stars 6-1 in the second overtime. It was the first of 19 overtime games in this year's NHL playoffs to require a second extra period.

Dallas won the Stanley Cup two years ago and lost in the finals to New Jersey last year. The Devils closed out the finals last year with a double-overtime victory.

The Stars lost Game 3 despite inspired efforts from goalie Ed Belfour and Mike Modano, who played 35 minutes after missing Game 2 with a sprained left ankle. Modano set up both Stars goals.

"It got better as the game went on," Modano said. "The more loose it got, the warmer it got."

The Stars were outshot 48-27, and Belfour stopped seven shots each from Al MacInnis and Scott Mellanby.

DEVILS 3, MAPLE LEAFS 2 (OT): Brian Rafalski's centering pass deflected in off the skate of Toronto defenseman Cory Cross seven minutes into overtime, lifting visiting New Jersey over Toronto.

Rafalski also set up Scott Gomez's game-tying goal, and Bobby Holik scored for the Devils.

The Maple Leafs, who play host to Thursday's Game 4, dropped their second straight playoff game after winning the first five.

Garry Valk, in his first appearance in these playoffs, and Steve Thomas scored for the Maple Leafs.

Toronto's Curtis Joseph made 42 saves.