Raiders rookie Karl Joseph’s knee and game are improving steadily

Raiders rookie Karl Joseph’s knee and game are improving steadily The rookie safety put it on, wore it into the locker room and then put it back on after he showered and dressed. The defense wasn’t as sharp as the hat, but made enough plays to win. Joseph, a first-round pick from West Virginia, had 10 tackles and continues to get better after missing the first two games coming back from a knee injury. “When you watched him coming out of college, there was nothing he couldn’t do,” defensive backs coach Marcus Robertson said. Joseph and the Raiders are giving up 20 points per game during their four-game winning streak, which is a big improvement from the first six games (32). The Texans did a nice job of running their tight-end routes into certain coverages we were playing, and we’ll keep working on stuff like that. “We know we’re always a couple of plays away, and know we just have to keep playing,” Joseph said. Mix in some more experience with that confidence, and watch out. “That’s what I call him,” Raiders assistant defensive backs coach and Hall of Famer Rod Woodson said. [...] the game is slowing down and I am gaining confidence. Vic Tafur is a San Francisco Chronicle staff writer.