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One player rumored to be on the trading block is Arizona Diamondbacks right fielder Justin Upton.
The 24-year-old two-time All-Star has been the target of much trade speculation this offseason. Upton put up good numbers in 2012—hitting .280 with 17 home runs and 67 RBI. He also has a career .832 OPS which is really good.
Why should a trade for Upton should be avoided?
Simply because he has not shown that he can perform on a high-level for a consistent amount of time.
Upton has two All-Star appearances but has also gone through several well-publicized slumps. One in particular took place earlier this year and prompted Diamondbacks managing partner Ken Kendrick to call him out in a radio interview.
As reported by Anthony Witrado of the Sporting News, Kendrick called Upton an "enigma" and also spoke about how he needs to become a more consistent performer.
These criticisms bothered Upton, who expressed his dissatisfaction with Kendrick's comments in an ESPN the Magazine article earlier this year.
"It was one of the more frustrating days of my life," Upton told Robert Sanchez. "I know I haven't played well, but being called out? Keep that stuff in-house."
The real question for potential suitors—especially large-market clubs—is can Upton handle criticism on a consistent basis? Until he has proven that he can teams should avoid trading for this star.