Each of the three Sharks-Blues games this season has had a different personality. The common denominator is that San Jose captured all of them in regulation, including an important 4-2 win at Scottrade Center on Tuesday night. On Oct. 15 here, the Sharks used a dirty hit by Maxim Lapierre on Dan Boyle to drive them to a 6-2 win. Brent Burns’ hat trick paced a 6-3 victory on Nov. 29 at SAP Center, and on Tuesday, the Sharks were able to take advantage of a shorthanded and possibly fatigued Blues team playing the second of a back-to-back and without a number of key contributors, including captain David Backes. “Tonight, I don’t think was indicative of what could happen down the road if we meet in the playoffs,” Todd McLellan said. “They’re going to have a different lineup, they’re going to be a lot fresher, but you have four or five of these games a year, you have to take advantage of it. We were good that way.” The Sharks were playing a team that was playing for the second straight night for the fourth time in the last six games. San Jose lost the previous three to Minnesota, the Islanders, and Carolina. The Blues were playing their third game in four nights, too. “We haven’t always taken advantage of that,” said Joe Pavelski, whose first period goal opened the scoring. “When you’re playing your third in [four nights], it doesn’t really matter. You’re not conceding the game, so we knew they wouldn’t lay down, especially at home.” The victory put the skids on an ugly four-game road losing streak for the Sharks, and was just their second win in the last seven games (2-4-1). But, the fact that it came against the club that entered with the NHL’s best record in terms of winning percentage, and that the Sharks handled some second period adversity that put them on the brink of blowing another multiple-goal lead, made Tuesday’s conclusion a bit of a sigh of relief. San Jose was dominant for the first half of the game in taking a 3-0 lead behind goals by Pavelski, Matt Irwin and Burns. But, then a big penalty kill by the Blues seemed to give them momentum, and goals from Kevin Shattenkirk and Jay Bouwmeester cut the lead to 3-2 at the second break.