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A.J. Burnett was a good pitcher in Florida and Toronto, but for some reason he could not handle New York.
Florida: 853.2 IP, 49-50, 3.73 ERA, 1.28 WHIP, 7.9 K/9, 4.0 BB/9, 0.7 HR/9
Toronto: 522 IP, 38-26, 3.94 ERA, 1.28 WHIP, 9.0 K/9, 3.3 BB/9, 1.0 HR/9
New York: 584 IP, 34-35, 4.79 ERA, 1.45 WHIP, 7.9 K/9, 4.0 BB/9, 1.2 HR/9
Let's hope this does not happen to Michael Pineda, who had a great rookie season in Seattle, but he is new to New York. The amount of pressure to succeed every time a pitcher steps on the mound in incredible.
Just think about this: Yankee Stadium's average attendance was 45,107 while Safeco Field averaged 23,411 people in attendance. Almost twice as many people go to Yankee home games as Mariner home games, and those numbers do not even include people watching at home online or on television.
The amount of media pressure in New York is a whole different beast than other big market cities. Some players cannot handle the pressure. Just ask A.J. Burnett.