Denver Broncos offensive lineman Dwayne Carswell was upgraded to serious condition Friday, a day after having his spleen removed and undergoing other surgery after a five-car traffic accident on his way to practice. "He's doing better, a lot better," coach Mike Shanahan said. "They think he will be able to sit up soon. He's still in the intensive care unit, but they're hoping he can be out of there by tomorrow." A team spokesman said Carswell had tubes removed and was breathing without assistance. "We feel good about his progress, which is a great sign," Shanahan said. "It's going to take some time to recover ... because a lot of those organs were pushed up very high in his body."