SAUGUS – There are no headliners on this year’s St. Mary’s girls hockey team ? no bright lights. There’s no No. 1 scorer in the history of the state to rally around if things start to bog down.Instead, this is more of an ensemble cast. Four lines and three sets of defensemen who show up, do their work, and share the stage,But there’s no difference between last year’s state championship team and this year’s in one crucial respect: They keep winning. Last night’s 3-0 smothering of Wakefield gives the Spartans their 20th straight victory this season – with one game to go Friday against Ursuline Academy. Put that with a 25-0 (including the tournament) record last year, that’s 45 straight wins, for anyone who’s into counting.Last night’s win at Kasabuski Rink was a tour de force of all the little things that make up a cohesive hockey team. There was plenty of positional play, a good deal of backchecking, some good – if not necessarily taxing – goaltending from Kelsey Magrane, and – most important – not a lot of flamboyance. Just old-fashioned hockey.”We’re much more balanced,” said assistant coach Michelle Bernhard, who held the reins last night as head coach Frank Pagliuca was serving the second of a two-game suspension after being tossed from the Framingham game over the weekend. “It all starts from the back and goes out.”And,” she says, “there’s a good team atmosphere here. Our goal all year has been to play with balance. And that’s where it all starts.”Even though the game was relatively close, the action was heavily one-sided. St. Mary’s had 35 shots, many of them taking dead aim on goalie Molly Pesseriani. Magrane faced seven. She was particularly lonely in the second period, as Wakefield barely made it into the Spartan zone, and she had to stop one shot.”This was actually a good game to win,” said Bernhard. “It was a good, tough game against a quality opponent.”This takes nothing away from Abby Gauthier and Christen Hart, the two senior offensive mainstays of last year’s team. Gauthier and Hart both had spectacular careers, but if the Spartans were going to win this year, they’d have to do it another way. Gauthier’s at Providence College and Hart’s in Southern Maine, and all that firepower had to be distributed among the players faced with defending the legacy.The Spartans have been up to the task. Courtney Winters, Courtney White, Michelle Golden, Alex Smith and Erin McAndrews – among others – have been equal to the task all season. And the role players have filled in nicely. The result may be a less explosive collection of players in comparison to the Gauthier-led juggernaut of a year ago, but it hasn’t stopped the victories from coming.Last night, St. Mary’s scored as the result of Wakefield mistakes. The first two, in the first period, were on the power play. Golden, standing at the point, rifled one that went in (thanks to a good screen by White) and it was 1-0 with 6:32 gone in the game.Winters got No. 2 with 10:48 gone in the period, with an assist from Golden. Winters’ shot somehow careened in after it had hit the post on Pesseriani’s glove side. At first the teams kept playing, but finally the referee whistled the play dead and counted the goal.The middle period was very much a defensive clinic by the Spartans, who backchecked the Warriors into oblivion. If a Wakefield player even ventured into Spartan territory, there was usually a defenseman there to skate her off to the side to avoid a one-on-one confrontation with Magrane.”We work a lot on that,” said Bernhard. “We work on moving them to the side, at an angle.”The third period took place almost exclusively in the Wakefield end, and only the athleticism of Pesseriani kept the game from getting out of hand. Still, the Spartans managed to sneak one by when Marisa Maccario took a goalmouth feed from White and jammed it in.