Oakland Raiders defensive end Khalil Mack (52) warms up before playing the Los Angeles Chargers in an NFL game at StubHub Center in Carson, Calif. on Sunday, Dec. 31, 2017. (Chase Stevens/Las Vega …

Oakland Raiders defensive end Khalil Mack (52) warms up before playing the Los Angeles Chargers in an NFL game at StubHub Center in Carson, Calif. on Sunday, Dec. 31, 2017. (Chase Stevens/Las Vegas Review-Journal) @csstevensphoto