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Yuniesky Betancourt isn't just a bad player, and he isn't just the worst player in baseball today.
He may be the worst player of all time.
Betancourt is a career shortstop, and has the types of numbers you'd expect from a defensive specialist: career batting average in the .270's, career on-base percentage under .300.
His OPS+ is in the 80's, and has been in the 60's. He has negative batting runs every year, and for his career he has -74.2 batting runs.
He strikes out almost three times as much as he walks (98/268), hits into too many double plays (an inexplicable 23 in 2008), and doesn't run the bases well (24/23 SB/CS ratio).
Four times in five years, Betancourt has batted over 500 times and failed to score 70 or more runs or collect over 160 hits. He has never had an on-base percentage over .310, or more than 21 walks in a season.
But that is all fine. A baseball team can accept bad offense from a gold glove shortstop.
But Betancourt is no Gold Glover. Indeed, he isn't even an adequate shortstop.
Hell, he isn't even a bad shortstop.
Yuniesky Betancourt is Derek Jeter. He is Hanley Ramirez.
He is the worst of the worst.
Of all shortstops in baseball, Betancourt has the second-worst Ultimate Zone Rating, behind Jeter and ahead of Han-Ram. In 2009, he was dead-last; the year before, he was second-worst again, ahead of Stephen Drew.
Of full-time shortstops in the AL, only Jeter and Erick Aybar have a lower total of fielding runs, according to baseballreference.com. Last season, only Orlando Cabrera was worse; in 2008, Betancourt was tied with Jason Bartlett for the worst.
Looking at the defensive component of WAR, again only Aybar and Jeter have been worse than Betancourt this season among AL shortstops.
It is a dizzying array of statistics, all of which point to one undeniable conclusion:
Yuniesky Betancourt is the worst player in Major League Baseball.