Case Keenum already has this fourth-quarter comeback thing down pat.Nail-biters are almost a prerequisite for a quarterback in Denver Cheap Frostee Rucker Jersey , where John Elway set the standard with 31 fourth-quarter comebacks and Peyton Manning added 11 of his league-best 43 while wearing navy and orange.Keenum, the architect of the "Minnesota Miracle" in the playoffs last year, followed his comeback win in his Denver debut by leading the Broncos to a 20-19 come-from-behind win against Oakland on Sunday.Brandon McManus kicked a 36-yard field goal just inside the right upright with 6 seconds left, capping a comeback from a 12-point second-half deficit."Anytime you have a game-winning drive in the fourth quarter, it feels pretty awesome," Keenum said. "Last week was fun. This week was a lot of fun. They're all special. And this is an incredible start, my first two games here at Mile High."The comeback denied Jon Gruden his first win as a head coach since 2008 — and his first against Denver since 2001."It's a tough loss," Gruden said after falling to 1-10 against Denver. "Really proud of our team. We had opportunities I think to come out of here with a win. I credit Denver."With no timeouts and 18 seconds left, Keenum hit Tim Patrick for a 26-yard gain to the Oakland 18. Cornerbacks Gareon Conley and Leon Hall couldn't tackle him inbounds and McManus came on to give the Broncos their first lead."I knew I had plenty of time to go up the field," Patrick said. "I just wanted to get as much yardage as I could while getting out of bounds at the same time."The Raiders (0-2) lost despite Derek Carr completing 29 of 32 passes for 288 yards and a score four days after Gruden called him out for passing up throws to Amari Cooper in Oakland's opener.Cooper caught 10 passes for 116 yards Sunday."I don't think Derek threw an incompletion today," Keenum marveled. "I never saw the ball hit the ground when he was out there. That's unbelievable to play quarterback like that."But we just kept fighting. We've got a lot of fighters in that locker room."The Broncos (2-0) trailed 19-7 late in the third quarter before McManus hit a 39-yarder and Keenum scored on a 1-yard keeper on fourth down with 5:58 left.Denver's defense held and the Broncos got the ball back at their 20 with 1:58 left. A holding call pushed them back 10 yards but Keenum hit Emmanuel Sanders for 21 yards and Jake Butt for 14.The Raiders limited the Broncos to just two first downs in the first half. Mike Nugent kicked two field goals and Marshawn Lynch's 1-yard dive late in the second quarter made it 12-0 but Shaq Barrett blocked the extra point."Who knew that would be huge?" Keenum asked."I'm mad as hell about that play," Raiders right tackle Donald Penn said. "But even without that play, we should have closed out that game. We had many opportunities to. We've got to find ways to get better."LOCAL HERODenver's Philip Lindsay, an undrafted rookie from Aurora, Colorado, who wasn't even invited to the NFL combine after a stellar career at the University of Colorado, totaled 111 yards from scrimmage. That made him the first undrafted player in league history to eclipse 100 yards from scrimmage in each of his first two NFL games."I am here to be our spark," said Lindsay Cheap Mike Nugent Jersey , who was just that with a 53-yard run in the first half.PORTERHOUSE PROBLEMVon Miller said teammate Todd Davis owes him a steak dinner for costing him his second strip sack of the season. Davis was whistled for holding, negating the strip sack and Domata Peko's fumble recovery at the Oakland 20."I had Derek Carr, it was one of the few plays that he held the ball," said Miller, who later had a sack that counted . "I was able to get in and get the sack. And the forced fumble. And we recovered it. But we had to go back out because Todd was doing the Viennese waltz with whoever it was out there."HOT TAKEIt was the hottest home game in team history. It was 92 degrees at kickoff, one degree hotter than the old mark set Sept. 19, 2010, against Seattle. To accommodate fans, the Broncos set up several hydration stations throughout the parking lots and encouraged fans to drink lots of water.INJURIESBroncos right tackle Jared Veldheer left with a concussion in the second half.UP NEXTOakland: The Raiders visit the Miami Dolphins on Sunday.Denver: The Broncos hit the road for the first time, visiting Baltimore Sunday. Three years after his last 1,000-yard season, Oakland Raiders running back Doug Martin is getting another chance to prove he can still be an effective player in the NFL.Marshawn Lynch's groin injury and subsequent surgery created a vacancy in the backfield and the Raiders are turning to Martin to fill the gap."I feel good, fresh legs," Martin said Thursday. "I was just making sure that when it was time to go I was ready."A two-time Pro Bowl back during his six-year stay with Tampa Bay, Martin expected to be a major part of coach Jon Gruden's running game when he signed a one-year, $1.475 million contract with Oakland in the offseason.The 29-year-old Martin instead has spent the majority of time as Lynch's understudy, rushing for 99 yards on 27 carries.That figures to change significantly with Lynch on injured reserve and out for at least two months."I've been a lead guy since high school so it was definitely something that was difficult for me," Martin said of his limited work. "But I've got people behind me Cheap Johnny Townsend Jersey , in my ear, telling me to keep working hard and keep pushing and your time will come."I'm 29, pushing 30 . so it's definitely an opportunity to show the rest of the league and the Raiders and everybody, all my doubters, that I can still play."Offensive coordinator Greg Olson doesn't expect Oakland's running game to change much despite the difference in running styles between Lynch and Martin.Lynch is a more bruising runner who powers his way through defenders and often pushes the pile an extra three to five yards downfield while Martin tends to be more of a finesse back."There's a different style, a little bit, between those two runners," Olson said. "Marshawn has a package of plays that suit his skills and Doug has a package of plays that suit his skills. They both fit within the system. We're excited to see what he can do."How effective Martin can be remains uncertain. While he will be the primary back this week against Indianapolis, Oakland is also likely to lean more on third-down back Jalen Richard and DeAndre Washington. Washington was inactive for the first six weeks of the season."We think Doug is the feature back," Gruden said. "He's ready to go. Jalen Richard has carved out a unique role. We'll try to get more out of him as we have been doing in recent weeks. To have DeAndre back . gives us some versatility that we'll try to use as well."Martin rushed for 4,633 yards during six uneven seasons with Tampa Bay. He twice ran for more than 1,400 yards but failed to reach 500 in the other four years while missing extensive time with a variety of injuries.Those injuries, Martin believes, were both a curse and a blessing. While it forced him to miss 28 games over five years, it also saved a lot of wear and tear on his body."I still have a lot of miles left on these wheels," Martin said. "This is my seventh year in the league. I'm going to go out there and just play like I've been playing. I've started for about six years so I'm just doing what I do."Notes: LG Kelechi Osemele (knee) did not practice. Osemele also sat out Wednesday and has not played since getting hurt against Cleveland on Sept. 30. . Former Raiders players and members of the front office will team up with the San Francisco 49ers on Monday to assemble care packages for U.S. troops overseas as part of Operation: Care and Comfort.