Cleveland Cavaliers PG Kyrie Irving is in a walking boot after suffering an ankle injury in practice before the Cavaliers head to Brazil to take on the Miami Heat in preseason action. Irving received both x-rays and an MRI before he left and both returned negative. He will be listed as day-to-day, and his status for Saturday’s preseason game is uncertain. Irving is building a reputation as an injury-prone NBA superstar. He ahs missed a total of 49 games over the last 3 seasons.