Preheat oven to 450°.
Combine juice and sugar in a medium saucepan over medium heat, and bring to a boil. Cook until reduced to 1/2 cup (about 8 minutes). Pour half of glaze into a small bowl; set aside.
Sprinkle pork evenly with salt and pepper. Place pork on the rack of a broiler pan coated with cooking spray; place rack in pan. Brush pork with half of glaze in saucepan. Bake at 450° for 15 minutes or until a thermometer registers 145°. Baste pork with remaining glaze in saucepan; cook an additional 5 minutes or until thermometer registers 155°.
Remove pork from oven; baste with half of glaze in bowl. Let pork stand 10 minutes. Cut pork across grain into thin slices. Serve pork with glaze mixture.
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