Helio Castroneves in Houston

HOUSTON -- Helio Castroneves and Scott Dixon -- the top two IZOD IndyCar Series championship contenders -- will start on Row 1 for Race 2 of the Shell and Pennzoil Grand Prix of Houston.

The starting grid was set by entrant points, in accordance with Rule of the IZOD IndyCar Series rulebook, as a rainstorm washed out the 30-minute morning qualifying session on the 1.634-mile, 10-turn circuit carved out of a parking lot at Reliant Park. NBC Sports Network will broadcast the 90-lap race at 1 p.m. (ET).

The last time qualifications were canceled because of weather was 2009 at Kentucky Speedway (Dixon sat on the pole).

Click it: Starting lineup || Dixon wins Race 1

Dixon, who won Race 1 on Oct. 5 to close to eight points of the front-running Castroneves in the championship chase, will start on the outside of Row 1 for the standing start.

Castroneves' No. 3 Team Penske car led in entrant points (486-452) over Dixon's No. 9 Target Chip Ganassi Racing car entering the doubleheader race weekend. He does not receive a bonus point for starting from the pole.

"If we were at a typical road course (qualifying) it wouldn't have been an issue with this amount of rain, but street courses seem to puddle a lot," Dixon said. "We probably would have liked to qualify; it seems Helio is struggling a bit this weekend. To have that separation the grid similar to yesterday would have been nice."

Dixon started third and Castroneves qualified a season-low 21st and finished 18th in the 90-lap Race 1.

"People's speeds are different from how the points have lined up so it should make for a really interesting race," Dixon added.

Simon Pagenaud in the No. 77 Schmidt Hamilton HP car and Marco Andretti in the No. 25 RC Cola car for Andretti Autosport will be on Row 2. Reigning series champion Ryan Hunter-Reay, driving the No. 1 DHL car for Andretti Autosport, and Justin Wilson in the No. 19 Dale Coyne Racing car will be on Row 3. Wilson earned his fourth podium of the season in Race 1.