Perkins, Celtics extend Cavs’ skid to 18 (AP)

Kendrick Perkins spent the last seven months coming back from a knee injury, and on the day he was set to return to the floor he showed up in the trainer’s office with a sore neck. He was so excited he couldn’t sleep. Playing for the first time since injuring his knee in Game 6 of the NBA finals, Perkins had seven points and six rebounds in 16 minutes as the Boston Celtics beat Cleveland…