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SAN DIEGO — Bruce Irvin has called himself the Robin to Khalil Mack’s Batman among the Raiders’ duo of pass rushers.

“Robin kind of showed up today,” Irvin said after his two-sack performance helped the Raiders to a 19-16 win over the San Diego Chargers that clinched the first postseason spot since 2002.

The second of Irvin’s sacks came on the Chargers final possession, which saw them begin at their own 14-yard line. Irvin backed them up further when he got around left tackle King Dunlap and chased a scrambling Rivers from behind on second down.

The pressure came from the other side on third-and-15 when Mack powered his way in there and hit Rivers as he tried to throw, setting up the decision play.

Irvin’s speed was too much for Dunlap as he got a clean release and made a beeline for Rivers. He got the pass off just before Irvin got to him, but his throw was picked off by Reggie Nelson and that turnover allowed the Raiders to run out the clock.

“Without the pressure, it wouldn’t have happened,” Nelson said. “Our front seven did a tremendous job today and put pressure on Philip and got him off his spot.”

Along with the sacks, Irvin also had his fifth forced fumble of the season — tying him with Mack for second in the NFL.

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“Robin woke up with a pep in his step,” Irvin said. “I had a good breakfast. I just felt good overall about the whole situation when I woke up, so I’m just happy I could contribute and we came out here with that W.”

While the Raiders haven’t had the sack totals as a team they’ve expected — Denico Autry also had one Sunday to give Oakland three on the day and 25 on the season — coach Jack Del Rio has praised their situational pressure. This was the best example yet of that.

“In key situations, it just seems that our defense always shows up,” Irvin said. “We knew it was going to be on us at the end of the game. Me and K-Mack talked and we knew we had to get to Philip if we wanted to win. That’s what we did and I’m just happy to be able to come out here with this win and get ready for next week.”

Del Rio loves what Irvin has added to this defense, both in production and leadership.

“Today the way he got around to the quarterback was the best part about it,” Del Rio said. “But I think from the moment Bruce arrived, he and Khalil had a natural competition or natural kind of bond where they’re two alpha males, they’re going to push each other really hard every day and compete every day. So Bruce has been tremendous for us, really a great addition to the football team.”