Cornerback Morris Claiborne missing the preseason opener due to injury has become an annual Dallas Cowboys tradition. Like his first two seasons, Claiborne will sit out Thursday’s preseason opener against the San Diego Chargers. He will miss his fifth straight practice Tuesday due to tendinitis in his right knee, but Claiborne isn’t concerned about missing significant time in training camp again. “I’m in a good place right now,” said Claiborne, who played only two preseason games as a rookie and none last year. “I’m good. I’m not stressed out over anything. I know this is like the third year that I’m missing time, but I’m in a better place than I was the last two years.”