* Troy Brouwer scores winner with 87 seconds to play * Capitals can clinch series with victory on Sunday (Adds quotes) The Washington Capitals put thedefending Stanley Cup champion Boston Bruins on the brink ofplayoff elimination with a 4-3 win in Boston on Saturday to graba 3-2 series lead in the Eastern Conference quarter-final. The seventh-seeded Capitals, who only earned a playoff berthin their penultimate game of the regular season, can close outthe best-of-seven first-round series with a win over thesecond-seeded Bruins in Washington on Sunday. With 87 seconds to play in regulation, Washington’s TroyBrouwer scored the winning goal on a power play when he sent ashot over the shoulder of Boston goalie Tim Thomas. “We just kind’ve regrouped in the neutral zone … I justdrove down the wing and let one go. I knew I just had to get iton net and it happened to go in,” said Brouwer, who added thathis team has plenty of confidence heading home. “Momentum is a big part in the playoffs and right now, goingback to our own building, especially with a quick turnaroundplaying tomorrow, we got a lot of confidence in ourselves.” Washington grabbed a 3-2 lead early in the third period whenMike Knuble sent a big rebound past a sprawling Thomas, but aJohnny Boychuk slapshot from 60-feet tied the score five minuteslater with 11 minutes to play. Washington had a 2-0 lead just past the midway mark of thesecond period on goals from Alexander Semin and Jay Beagle. But the Bruins responded three minutes later when DennisSeidenberg and Brad Marchand scored 28 seconds apart, sendingthe home crowd at TD Garden into a frenzy leading into thesecond intermission.