1:02pm: Lopez and Robles are involved in trade talks, Nationals reporter Mark Zuckerman tweets. The Pirates would like a third player as well.
12:58pm: The Pirates and Nationals, who discussed an Andrew McCutchen deal last summer, have talked more about the deal lately, and the Nats would like to complete a deal today, Jayson Stark writes. The idea is that, if the Nationals can acquire McCutchen today, they can install him in the outfield, move Trea Turner back to the infield, and non-tender Danny Espinosa before tomorrow's non-tender deadline.
Stark writes that young starters Joe Ross and Reynaldo Lopez could be on the Pirates' wish list, although it's unclear if that might just be educated speculation. In any case, Ross would be a terrific addition -- he's still just 23, is controllable for five more years, throws relatively hard and already has a solid big-league track record as a starter. Lopez is interesting too -- he's 22 and pitched very well in the high minors last season. He had control issues in a brief trial in the majors, but he threw in the mid to high 90s and would appear to have significant upside.
Outfield prospect Victor Robles, who the Pirates reportedly targeted last summer, is another name to watch. MLB.com currently ranks him the 10th-best prospect in the game, although he's much further from the big leagues than Ross or Lopez and would probably need at least a year and a half in the minors.