The Los Angeles Lakers didn’t have to get a win in Denver to win their first-round series, but championship teams find ways to scrape out W’s on the road and shorten a series. That’s exactly what Los Angeles did last in Game 4, as they beat Denver. With the Lakers, along with the Sixers and Celtics, taking 3-1 leads in their first-round series, it feels like we’re living some early 1980s retro—all we need is Dr. J, Magic and Bird in the house to make it complete. And the fourth game going Sunday, Heat-Knicks, is also at 3-1, although in this case it’s because New York staved off elimination. TheSportsNotebook recaps Sunday’s grand slam and looks ahead to Monday’s doubleheader…