Browns rookie running back Montario Hardesty left his exhibition debut on Thursday because of an injured left knee. Hardesty missed all of training camp with a bone bruise in his right knee. He stayed on the ground for several minutes before walking to the sideline. "I hurt my knee making a cut," Hardesty said. "I really don't know what it is. I can't say it's not frustrating. I want to stay positive, get as much information as possible and return my focus to getting better. I'm hopeful whatever it is, I can get back as soon as possible." He was scheduled for an MRI on Friday.