I have to attend to family obligations before liveblogging tonight’s Screen Actors Guild Awards, so I’m putting up Steve Mason’s preliminary weekend estimates that he’s basing on Saturday numbers at Fantasy Moguls. Mase has “Meet the Spartans” in first place with $18.58 million, vanquishing “Rambo” to No. 2 at $17.28 million. Per Steve, “27 Dresses” will squeeze one-weekend wonder “Cloverfield” out of third into fourth, with $13.78 million versus $12.93 for what had been the biggest January opening ever. “Untraceable” is in fifth with $11.37.