Final round-by-round results from the 20th annual O'Reilly NHRA Spring Nationals presented by Pennzoil at Houston Raceway Park, the fourth of 23 events in the NHRA POWERade Drag Racing Series:

TOP FUEL:

ROUND ONE -- Joe Hartley, 4.820, 246.57 def. Hillary Will, 10.184, 73.84; J.R. Todd, 4.597, 307.58 def. Clay Millican, 4.642, 323.97; Larry Dixon, 4.626, 309.06 def. Doug Kalitta, 4.748, 295.27; Brandon Bernstein, 4.553, 322.58 def. Tony Schumacher, 4.540, 309.42; David Grubnic, 4.620, 317.42 def. Morgan Lucas, 10.135, 93.56; Bruce Litton, 4.703, 303.37 def. Rod Fuller, 12.287, 73.92; Whit Bazemore, 4.559, 320.05 def. Cory McClenathan, 5.719, 171.51; Melanie Troxel, 4.623, 314.39 def.  Alan Bradshaw, 5.668, 172.47;

QUARTERFINALS -- Dixon, 4.620, 311.92 def. Litton, 4.686, 312.13; Todd, 4.642, 314.24 def. Troxel, 6.039, 201.19; Hartley, 4.894, 253.18 def. Bazemore, 6.621, 133.68; Grubnic, 4.918, 296.83 def. Bernstein, 5.216, 187.52;

SEMIFINALS -- Hartley, 4.623, 316.15 def. Grubnic, 4.661, 307.72; Todd, 4.638, 300.40 def. Dixon, 4.914, 245.54;

FINAL -- Todd, 4.603, 313.80 def. Hartley, 4.645, 307.79.

FUNNY CAR:

ROUND ONE -- Del Worsham, Chevy Monte Carlo, 10.826, 87.54 def. Gary Densham, Monte Carlo, foul; Jim Head, Toyota Solara, 4.899, 314.97 def. Tim Wilkerson, Monte Carlo, 12.547, 81.45; Mike Ashley, Dodge Charger, 4.788, 325.30 def. Tommy Johnson Jr., Chevy Impala, 6.127, 162.16; Cruz Pedregon, Monte Carlo, 4.826, 309.56 def. Todd Simpson, Chevy Camaro, 5.303, 255.19; Tony Bartone, Monte Carlo, 4.911, 301.20 def. Tony Pedregon, Monte Carlo, 6.458, 150.51; Ron Capps, Charger, 4.872, 313.95 def. Jack Beckman, Charger, 4.906, 312.78; Gary Scelzi, Charger, 4.804, 317.05 def. Kenny Bernstein, Charger, 7.931, 102.22; Bob Gilbertson, Dodge Stratus, 4.907, 304.94 def. Jeff Arend, Monte Carlo, 4.908, 308.71;

QUARTERFINALS -- Worsham, 5.021, 302.69 def. Bartone, 7.443, 119.96; C. Pedregon, 5.367, 240.47 def. Gilbertson, 14.262, 82.21; Head, 4.869, 306.53 def. Ashley, foul; Capps, 4.866, 312.42 def. Scelzi, 9.254, 96.96;

SEMIFINALS -- C. Pedregon, 4.875, 310.70 def. Head, 4.923, 309.56; Capps, 4.869, 306.19 def. Worsham, 6.950, 139.21;

FINAL -- Capps, 4.868, 307.93 def. C. Pedregon, 5.025, 270.97.

PRO STOCK:

ROUND ONE -- Greg Stanfield, Pontiac GTO, 6.721, 205.69 def. Mike Edwards, GTO, foul; Dave Connolly, Chevy Cobalt, 6.703, 205.63 def. V. Gaines, Dodge Stratus, 6.684, 206.86; Richie Stevens, Stratus, 6.709, 205.54 def. Jim Yates, GTO, foul; Warren Johnson, GTO, 6.708, 206.13 def. Tom Hammonds, Cobalt, 6.772, 204.73; Jason Line, GTO, 6.691, 206.95 def. Kurt Johnson, Cobalt, 11.654, 75.10; Jeg Coughlin, Cobalt, 6.677, 206.51 def. Kenny Koretsky, Cobalt, 6.753, 205.85; Greg Anderson, GTO, 6.672, 207.50 def. Larry Morgan, Stratus, 6.748, 205.98; Allen Johnson, Stratus, 6.704, 205.85 def. Erica Enders, Stratus, 6.722, 205.38;

QUARTERFINALS -- A. Johnson, 6.686, 206.64 def. Stevens, 6.746, 205.57; Line, 6.669, 207.78 def. W. Johnson, 6.889, 204.42; Coughlin, 6.679, 207.34 def. Stanfield, 6.704, 206.76; Connolly, 6.682, 207.24 def. Anderson, 12.073, 72.08;

SEMIFINALS -- A. Johnson, 6.714, 206.73 def. Connolly, 6.669, 207.40; Line, 6.682, 207.98 def. Coughlin, 6.760, 206.51;

FINAL -- Line, 6.661, 207.75 def. A. Johnson, 6.712, 206.26.

PRO STOCK MOTORCYCLE:

ROUND ONE -- Craig Treble, Suzuki, 7.105, 187.73 def. Matt Guidera, Buell, 7.137, 182.38; Peggy Llewellyn, 7.155, 184.07 def. Eddie Krawiec, Harley-Davidson, foul; Antron Brown, Suzuki, 7.113, 185.21 def. Scott Lewis, Suzuki, foul; Chris Rivas, Buell, 10.673, 74.61 def. Chip Ellis, Buell, foul; Joe DeSantis, Suzuki, 7.173, 185.13 def. Karen Stoffer, Suzuki, foul; Angelle Sampey, Suzuki, 7.050, 191.10 def. Shawn Gann, Suzuki, foul; Tom Bradford, Buell, 7.099, 186.10 def. Andrew Hines, Harley-Davidson, foul; Steve Johnson, Suzuki, 7.112, 188.10 def. Matt Smith, Buell, foul;

QUARTERFINALS -- Rivas, 7.124, 186.69 def. DeSantis, 7.226, 182.85; Treble, 7.057, 189.66 def. Johnson, 7.109, 188.15; Bradford, 7.188, 185.51 def. Brown, foul; Sampey, 6.947, 192.14 def. Llewellyn, 7.173, 181.72;

SEMIFINALS -- Treble, 7.138, 186.72 def. Rivas, 7.301, 178.12; Sampey, 6.984, 192.69 def. Bradford, foul;

FINAL -- Sampey, 7.046, 188.91 def. Treble, 7.516, 145.59.