Fox Sports' Ken Rosenthal just broke the news late on this Sunday night that the Cubs have traded outfielder Scott Hairston to the Washington Nationals for a minor league pitcher. We don't know who that pitcher is yet, and it sounds like we won't find out until Monday morning:

Even with the Cubs making three trades last week and being fully expected to make more trades as we approach the July 31st deadline, this Hairston trade comes as a bit of a surprise. Well, at least the timing with the trade, anyway.

The 33-year-old Hairston homered in his only at-bat (pinch-hitting) in the Cubs' 4-3 win over the Pirates on Sunday, and homered in his last start, on Friday (also against the Pirates). So he's swinging the bat well over the last few days, but overall on the season? Not so much.

On the season, Hairston has a .172/.232/.434 line in 112 plate appearances, with eight homers, 19 RBI, seven walks, 25 strikeouts, and two stolen bases. He's at least made the most out of those 112 plate appearances with the eight home runs, and 19 RBI. He also has four sacrifice flies. What's incredible he has more homers than singles (seven) even on the season (and almost as many sacrifice flies too).

However, Hairston is coming off a very nice 2012 season with the Mets, in which he hit 20 homers, drove in 57 runs, and put up an .803 OPS in 398 plate appearances. Versus left-handed pitching, Hairston had an .867 OPS in 2012, and on his career, an .813 OPS versus southpaws in 1,008 plate appearances.

That's certainly what the Nationals saw with this move: A veteran outfielder that has been very successful against left-handed pitching in his career, particularly in the power department over the last few years. He makes for a very fine platoon outfielder, and at an affordable price. Hairston, who signed with the Cubs over the offseason, is making $2.5 million this season, and is under contract for the same amount of money in 2014.

In regards to the Cubs and Hairston, I fully expected them to use him as trade bait this season, but with his struggles, thought they may not find a trade offer to their liking- especially this soon. I figured they'd hope he improves his numbers a bit more as we approached the deadline, enhancing his value. But, clearly they liked this minor league pitcher the Nationals were offering enough to jump on a deal involving Hairston over three weeks before the trade deadline.

While Rosenthal didn't suggest it in his tweets, I wouldn't be surprised if the Cubs also came away with some international slot money from the Nationals in the deal, as the Cubs appear to be over their spending limit for this year once they make the signing of 16-year-old Dominican Republic outfielder Eloy Jimenez official, and don't want to be penalized by MLB with restrictions in their international spending for 2014.

Now, in terms of what corresponding roster move could be happening for the Cubs after this trade? That's anyone's guess right now.

Alfonso Soriano is of course going to be starting most everyday (until he's potentially dealt this month as well), but after him, only Dave Sappelt offers right-handed hitting among Cubs outfielders. And Sappelt's done little at the major league level, or even at Triple-A Iowa, to warrant much more playing time.

Looking at theoretical right-handed hitting replacement options down on the farm, Junior Lake is a possibility, but he only has 32 games under his belt in Triple-A. Then there's outfielder Matt Szczur, but he's still at Double-A. The Cubs have made it known that they would like their prospects getting a lot of time at Triple-A before getting a call-up to join the big club.

It's also possible the Cubs will just forget about "handedness"and not worry about a right field "platoon" with Nate Schierholtz. I mean, it's not like they're all that concerned about winning this year anyway. They could add a left-handed bat to the roster, such as infielder Logan Watkins, a promising prospect currently at Iowa. Or maybe there's another trade on the way. Who knows?

We should know much more by the morning, so stay tuned.

Update: CBS Sports' Jon Heyman tweets that the pitcher the Cubs acquired is in "A-ball":

So, there's at least a little more info, and hopefully we'll have an actual, you know, -name- of the pitcher by the morning.

Update #2: Heyman now tweets that the Cubs are paying for a small amount of Hairston's 2014 contract, with the Nats paying all of it for 2013:

Update #3: The trade is now official, and the pitcher the Cubs received in the deal is 21-year-old Ivan Pineyro, who was most recently pitching at High-A Potomac (Carolina League) in the Nationals' system. Additionally, both teams will receive the 'ol PTBNL (Player To Be Named Later, for those of you newbies) in the deal.

Pineyro is a 6'1", 198-pound right-handed starting pitcher that made 15 starts in 2013 between Potomac (two starts) and Single-A Hagerstown (13 starts).

Combined between the two levels this season, Pineyro went 6-3, with a 3.24 ERA, with 72 strikeouts compared to 22 walks,  and a 1.159 WHIP in 77 2/3 innings pitched. Over his minor league career (which began in 2011), Pineyro is 13-11, with a a 3.17 ERA, 1.223 WHIP, and 3.42 strikeout-to-walk ratio (195 K, 57 walks) in 204 1/3 innings pitched.

Pineyro was ranked by Baseball America as the Nationals' 27th best prospect coming into the 2013 season (and you'd think with how well he's done this year, he would've moved up those rankings in a bit if BA re-did them). 

As far as the corresponding roster move we were wondering about, left-handed pitcher Brooks Raley is coming up from Iowa to add another arm to the tired Cubs bullpen, and Jed Hoyer says (as you'll see below) the Cubs will "explore options"on adding another right-handed hitter to the roster.

Here's some more from the Chicago Sun-Times:
“He’s a young arm we’re excited to get in our system,” general manager Jed Hoyer said, who added that a player to be named could be added to both sides of the deal but that it wouldn’t be a significant player in either case.
Pineyro, 21, is 6-3 with a 3.24 ERA in 15 starts combined at Class A Hagerstown (13 starts) and advanced-A Potomac (two). He’ll report to advanced-A Daytona to start his Cubs career.
The Cubs replaced Hairston on the roster with left-hander Brooks Raley to bolster a taxed bullpen short term. Hoyer said the club will “explore options” for adding right-handed hitter to the bench once the bullpen no longer needs the extra arm.
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