Sheffield: Javier Baez Needs Work on Swing

http://www.sportsgrid.com/mlb/the-javier-baez-gary-sheffield-comparison-is-uncanny/

They do have an uncanny resemblance as noted above. The size, the strength and power, the quick bat, the torquing of the bat as a timing mechanism. All very similar. You almost wish the Cubs had hired Sheffield as his batting coach rather than Manny Ramirez. You almost couldn't go wrong with either one, the two most lethal RH power bats of the era, both better hitters overall than McGwire.

from Bleacher Report:
Sheffield: Javier Baez Needs Work on Swing:

"When I saw this guy swing [in December], I knew he was going to be a big leaguer for them soon," Sheffield told ESPNChicago.com on Tuesday. "Right now when I watch his swing, he has something in his swing that can be fixed real easy. He collapses his back leg. And anytime you do that, a pitcher is going to have a field day on you. 

"When you collapse your back leg, anything over the belt line you have to uppercut. You can't stay on top of it." 

"Keeping that back foot anchored is important," Cubs hitting coach Bill Mueller said. "It's necessary for sure in keeping square. What's most important is him getting games played. It's a small sample size." 

Manager Rick Renteria added: "When we look at his film, the one thing that stands out is if he swings at strikes, he does damage. When he swings at balls, he doesn't. That has nothing to do with mechanics." 

Sheffield disagrees, to an extent. 

"I see all the ability," said Sheffield, who hit 509 home runs in 22 seasons. "And I see someone has to get with him real quick and fix that little mechanical issue that he has before it gets worse. When you're trying to create that much torque with your lower half collapsing, that's a lot of moving parts. People would ask me, 'How could you do that with all that wiggling the bat like that?' Because it's not how you start it's how you finish. I was always focused on my finish, not how I start." 

'via Blog this'

It looks like, from the motion picture of Baez (shown below), that Baez lunges or almost leaps forward at the pitch rather than staying back as well as he should. The back leg will collapse like that when you stride out too far and miss.

That may just be his youthful exuberance rather than a purely mechanical mistake. He will learn pretty soon that you get the same credit for the HR's that go 325 feet as you do for the 450 footers. But what do I know, I still think chicks dig the long ball, so maybe longer is better.

Also, agree with Renetria on the plate discipline issue. He can be a guy who hits 25 HR's with a .230 average or a 35-40 HR guy hitting .280 - .300 if he corrects that because this yard will not hold him, and once they get Bryant and Rizzo surrounding him or behind him, watch out. He has to fix the ball / strike discipline issue or he'll be hitting lower in the order, behind those other power guys.