It doesn’t get much closer than this. Through six games of their NHL Eastern Conference semifinal series, the seventh-seeded Washington Capitals and the No. 1 New York Rangers have alternated wins and losses, and have been tied or within one goal 90 percent of the time. The club that has scored first has won every game in the matchup. The teams face off once more today at Madison Square Garden in Game 7 ( 4:30 p.m., NBC Sports). There will be a Game 7 today in the NBA playoffs as well, with the Denver Nuggets at the Los Angeles Lakers ( 7:30 p.m., TNT).