Jeff Green and Elliott Sadler set the pace during Monday's opening day of NASCAR Preseason Thunder Las Vegas at Las Vegas Motor Speedway. Green posted the fastest speed of the day during the morning session with a lap of 170.068 mph. Sadler was fastest during the afternoon session even after a spin in turn three. Green and Sadler were among 24 drivers on hand to test their cars for the March 12 UAW-DaimlerChrysler 400. Speedway officials expect 45 teams to test on Tuesday. "We did a lot of winter testing and it looks like it has paid off," said Sadler, who drives the M&M's Ford for Robert Yates Racing. "We were pretty fast in both practices and we are very comfortable, and I think we have a good shot of coming back and running good. All of the hard work that the team had done has paid off. We will come back and try to learn more tomorrow, but as of right now I don't think we could be any happier." The only incident other than Sadler's spin was a blown engine by rookie Brent Sherman during the morning session. "I was a little tight so I tried to use the apron to help the car turn and I learned that I shouldn't do that," said Sadler. "I'm glad I learned it now during practice rather than during the race." Mark Martin (169.369 mph), Jeff Burton (169.083 mph) and Kevin Harvick (168.592 mph) rounded out the top five drivers with practice times. The public is invited to watch the test sessions free of charge each day from 9 a.m. to 5 p.m. Tickets for the March 10-12 NASCAR Weekend are available by calling 1-800-644-4444 or logging on to Here is a tentative list of test dates and drivers: Tuesday: Clint Bowyer, Jeff Burton, Dale Earnhardt Jr., Robby Gordon, Jeff Green, Kevin Harvick, Dale Jarrett, Travis Kvapil, Mark Martin, Jamie McMurray, Elliott Sadler, Hermie Sadler, Ken Schrader, Brent Sherman, Reed Sorenson, David Stremme, Martin Truex Jr., Michael Waltrip and Scott Wimmer. Tuesday-Wednesday: Greg Biffle, Kurt Busch, Kyle Busch, Carl Edwards, Jeff Gordon, Jimmie Johnson, Kasey Kahne, Matt Kenseth, Bobby Labonte, Terry Labonte, Sterling Marlin, Jeremy Mayfield, Casey Mears, Joe Nemechek, Ryan Newman, Kyle Petty, Scott Riggs and Brian Vickers. Wednesday: Denny Hamlin, Tony Stewart and J.J. Yeley. Monday's fast speeds 1. Jeff Green, Chevrolet, 170.068 mph 2. Elliott Sadler, Ford, 169.428 mph 3. Mark Martin, Ford, 169.369 mph 4. Jeff Burton, Chevrolet, 169.083 mph 5. Kevin Harvick, Chevrolet, 168.592 mph 6. Robby Gordon, Chevrolet, 168.224 mph 7. Dale Jarrett, Ford, 168.130 mph 8. Clint Bowyer, Chevrolet, 168.046 mph 9. Dale Earnhardt, Jr., Chevrolet, 167.593 mph 10. Jamie McMurray, Ford, 167.520 mph 11. J.J. Yeley, Chevrolet, 167.385 mph 12. Tony Stewart, Chevrolet, 167.250 mph 13. Scott Wimmer, Chevrolet, 167.245 mph 14. Reed Sorenson, Dodge, 167.219 mph 15. Denny Hamlin, Chevrolet, 167.141 mph 16. Martin Truex, Jr., Chevrolet, 166.795 mph 17. David Stremme, Dodge, 166.507 mph 18. Kenny Wallace, Chevrolet, 166.477 mph 19. Kevin Lepage, Ford, 166.241 mph 20. Bobby Hamilton, Jr., Dodge, 165.960 mph 21. Chad Chaffin, Chevrolet, 165.254 mph 22. Brent Sherman, Dodge, 165.011 23. Michael Waltrip, Dodge, 164.144 mph 24. Hermie Sadler, Ford, 163.716