White Sox sign Melky Cabrera to play left field

After the White Sox acquired pitcher Jeff Samardzija last week, we said that wouldn't be enough to make the South Siders a legitimate contender.

We said they needed to press forward and fix other holes, including the ongoing problem in left field. On Saturday night, general manager Rick Hahn addressed the outfield issue, agreeing to terms with Melky Cabrera on a three-year, $42 million contract.

Critics of this move will note Cabrera was busted for PED use while with the San Francisco Giants in 2012. I'm not too concerned about that because the switch-hitter has continued to produce since that incident, suggesting his success wasn't entirely the result of chemical enhancements.

Check out Cabrera's numbers over the past four years:

2011 with the Kansas City Royals: .305/.339/.470, 18 HRs, 87 RBIs
2012 with San Francisco: .346/.390/.516, 11 HRs, 60 RBIs
2013 with the Toronto Blue Jays: .279/.322/.360, 3 HRs, 30 RBIs
2014 with Toronto: .301/.351/.458, 16 HRs, 73 RBIs

Cabrera has hit .300 or better in three of the past four years, with the only exception being his injury-riddled 2013 season where he was limited to 88 games. If he's healthy, he's going to hit.

Here's the thing I like about Cabrera. He doesn't care if there's a left-handed pitcher or a right-handed pitcher on the mound. Here are his platoon splits over the past four seasons:

vs. LHP: 308/..350/.477
vs. RHP: .309/.352/.451

We can see there is more pop in his bat from the right side of the plate, but the batting average and on-base percentage are essentially the same from either side. This is a guy manager Robin Ventura can just pencil in every day in the No. 2 spot in the batting order, regardless of who the opposing pitcher is.

Defensively, Cabrera possesses one of the better throwing arms in the league, although his defense has regressed a bit the past couple years playing on the artificial surface in Toronto.

I think the Sox need to focus on defense when selecting a fourth outfielder, because neither Cabrera nor right fielder Avisail Garcia can play center field, if something should happen to Adam Eaton. Whoever the backup outfielder is must be able to handle center field adequately, which means Dayan Viciedo is going to be shown the door one way or another before next season begins.

We'll see if Hahn can get Viciedo out of town in exchange for the bullpen arm he still needs.

White Sox acquire pitcher Dan Jennings from Miami Marlins

The last time I saw Andre Rienzo pitch in person, he gave up a home run to Minnesota outfielder Oswaldo Arcia that landed on the concourse beyond the right-field bleachers at U.S. Cellular Field. That ball had to travel at least 460 feet.

White Sox fans won't have to worry about seeing such horror from Rienzo any longer, as the less-than-mediocre right-hander was traded Thursday to the Miami Marlins in exchange for left-handed relief pitcher Dan Jennings.

The Sox already added Zach Duke to be the main lefty out of their bullpen, but it never hurts to have two left-handers around to pitch in relief. Perhaps Jennings can be that second guy.

Jennings, 27, worked in 47 games last year for the Marlins. He compiled a 1.34 ERA and 1.5337 WHIP. He allowed 45 hits and struck out 38 in 40.1 IP. At one point, Jennings had a stretch of 19 consecutive appearances where he did not allow an earned run.

I don't think I'd count on Jennings to be a high-leverage reliever. He gives up a few too many hits for that. However, he's a guy who can be used in the sixth or the seventh inning. He's also the type who will probably pitch in games where the Sox are trailing, so Duke can be saved to pitch in games where the Sox are leading.

It is important for manager Robin Ventura and pitching coach Don Cooper to understand that Jennings is not a left-handed specialist, so don't use him in that way. In fact, left-handed hitters have hit more than 50 points higher than right-handed hitters against Jennings over the course of his career:

Career vs. left-handed hitters: .289/.354/.403
Career vs. right-handed hitters: .238/.322/.389

The trend of being more successful against righties also can be seen in Jennings' 2014 numbers:

2014 vs. left-handed hitters: .299/.364/.390
2014 vs. right-handed hitters: .265/.326/.398

Modern managers love to use left-handed pitchers against left-handed hitters, but Jennings is one pitcher where Ventura will need to go against the conventional wisdom. He shouldn't bring Jennings in specifically to face a left-handed hitter unless that particular hitter is especially weak against left-handed pitching.

As for Rienzo, well, the 26-year-old will not be missed on the South Side after going 4-5 with a 6.82 ERA in 18 games (11 starts) in 2014. Maybe he will benefit from a change of scenery, but he was not in the Sox' plans.

White Sox acquire Jeff Samardzija from A's in six-player deal

The White Sox on Tuesday signaled their intention to contend in 2015, acquiring starting pitcher Jeff Samardzija and minor leaguer pitcher Michael Ynoa from the Oakland Athletics in exchange for infielder Marcus Semien, pitcher Chris Bassitt, catcher Josh Phegley and first baseman Rangel Ravelo.

From a purely baseball perspective, Samardzija is exactly what the Sox need. He's a legitimate No. 2 starter, a right-hander who can be slotted nicely in between ace left-hander Chris Sale and left-hander Jose Quintana in the rotation. One through three, the Sox can now match up with just about everybody in terms of starting pitching.

The downside to this deal from the Sox perspective? Samardzija is entering the last year of his contract. He could be here today, gone tomorrow, and if the Sox don't win in 2015, this deal is a waste.

The good news is the Sox did not include any of their top prospects in this deal. Carlos Rodon, Tim Anderson, Micah Johnson and Francellis Montas are all still in the organization. It would have been a questionable move to give up any of the top young guys for potentially just one year of Samardzija.

The four guys the Sox parted with are all guys you can replace. Semien is an athletic, versatile player with some pop in his bat. However, he was a player without a position. The Sox even had him play some outfield in Triple-A last year just to see how he would react. He projects as a utility player. There are plenty of those around.

Bassitt has a good arm and got a look in the major leagues at the tail end of the 2014 season. The Sox were using him as a starter, but most believe his eventual role will be in the bullpen. An interesting pitcher, sure, but not an untouchable.

The White Sox coaching staff never warmed up to Phegley, primarily because of his defensive limitations. He was not in the organization's plans. Good riddance.

Ravelo is a guy who needed to change organizations. He has some promise as a hitter, but he's a right-handed hitting first baseman. The Sox already have one of the best right-handed hitting first basemen in the game in Jose Abreu. Ravelo is not a candidate to take Abreu's job anytime soon. He was expendable.

The Sox have eroded some of their organizational depth with this trade, but you can live with that if Samardzija pushes you into the playoffs next season.

Here's the key moving forward: The Sox can't stop here. With the addition of Samardzija and closer David Robertson, this is now an 85-win team. That's a huge step forward over last year, but it's still not good enough.

You may have Sale and Samardzija at the top of the rotation for just one year, so general manager Rick Hahn needs to keep pushing and make this team a potential 95-game winner. The time to go for it is right now.

Do something to upgrade left field. There is no more time to be patient with Dayan Viciedo. Add another bullpen pitcher to set Robertson up. Maybe think about a veteran to help at the back end of the rotation. There are mediocre incumbents at catcher, third base and second base. Upgrade at one of those spots, if possible.

The White Sox are close to being a good team, but they aren't quite there yet. Hahn has now put himself in position to get to that point before the offseason is over.

White Sox agree to four-year deal with closer David Robertson

The White Sox moved late Monday night to shore up a glaring weakness, agreeing to terms on a four-year, $46 million contract with closer David Robertson, multiple sources said.

Robertson, 29, took over the closer's role in New York last year from Mariano Rivera and went 4-5 with a 3.08 ERA and 39 saves for the Yankees. He has a 2.81 career ERA in seven seasons.

The Sox were a disaster in the bullpen in 2014, so while this move might be an overpay, it is something the South Siders absolutely had to do.

Their closer by committee approach last year totaled just 36 saves, which was better than only five major league teams. Their 4.28 bullpen ERA ranked 28th out of the 30 teams in baseball. Only the Colorado Rockies and Houston Astros were worse. A big move was necessary. The signing of Robertson qualifies.

What's to like about Robertson? He strikes people out.

For his career, Robertson has struck out 12.0 batters per nine innings pitched. As the New York closer last season, he fanned 96 men in 64.1 innings pitched. That's a rate of 13.4 strikeouts per nine innings. He struck out more than 37 percent of the batters he faced in 2014. If opposing batters can't put the ball in play, they can't get hits. That's a trait you like in any closer.

About the only concern I have with Robertson: He gave up seven home runs last year. That's a little high, but considering what the Sox had last year in the bullpen, I'll take my chances.

You figure Robertson, left-hander Zach Duke and right-hander Jake Petricka now make up the back end of the Sox' bullpen. I wouldn't be surprised if we see another relief pitcher or two added before the offseason is over. The Sox are believed to be targeting Park Ridge native Luke Gregerson, who has pitched previously with the San Diego Padres and Oakland Athletics.

Stay tuned.