Raiders have no worries about Khalil Mack

Texans linebacker Jadeveon Clowney got a lot of attention for his sack of Falcons quarterback Matt Ryan during last week’s preseason game, but there was no such acclaim for Raiders linebacker Khalil Mack after his own sack. That’s because Mack’s sack came against backups for the Lions, which isn’t exactly what you’d call a crowning achievement…