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Trim fat from meat.
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Place meat in a plastic bag set in a shallow dish.
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For marinade, in a small bowl combine orange juice, lime juice, garlic, sugar and oregano.
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Pour the marinade over the meat and seal the bag.
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Marinate in the refrigerator overnight, turning bag occasionally.
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Drain meat, discarding marinade.
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Place meat on a rack in a shallow roasting pan.
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Insert an oven-going thermometer into the center of the meat.
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Sprinkle the meat with salt and pepper.
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Roast in a 350 deg oven for 45 to 60 minutes or until thermometer registers 155 degrees.
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Cover with foil; let stand for 10 minutes before slicing (the temperature of the meat after standing should be 160 degrees).