INDIANAPOLIS – The exhilarating run for the Indianapolis 500 pole position takes place today at Indianapolis Motor Speedway.

The 33 car-driver combinations that will compete in the 102nd running of “The Greatest Spectacle in Racing” on May 27 were determined in first-day qualifications on Saturday. Each driver must make one more nerve-racking, four-lap, 10-mile run on the IMS oval today to decide the grid starting positions for the race.

INDIANAPOLIS 500 PRESENTED BY PENNGRADE MOTOR OIL: Pole day qualifications order

The process for today is simple. Group 1 qualifying starts at 2:45 p.m. ET and sets starting positions 10 through 33. The drivers who qualified in those provisional places on Saturday will each make an attempt today, in reverse order of their Saturday speeds.

That means James Davison, who was 33rd fastest on Saturday, will be first in line to qualify today in the No. 33 Jonathan Byrd’s 502 East Chevrolet and Alexander Rossi, 10th fastest on Saturday in the No. 27 NAPA AUTO PARTS Honda, will be the final Group 1 qualifier. The fastest from that group of 24 drivers will start the race in 10th position.

Following that, the electric Fast Nine Shootout at 5 p.m. will decide the Verizon P1 Award pole winner and starting order for the first three rows. The top nine qualifiers from Saturday – including three-time Indy 500 winner Helio Castroneves, 2008 race winner Scott Dixon and Danica Patrick as she closes in on the last race of her fabled racing career – also make one qualifying attempt each, again in reverse order of their speeds from Saturday.

Castroneves, in the No. 3 Pennzoil Team Penske Chevrolet, is a four-time Indy 500 pole sitter. Only Rick Mears, with six, has more. Castroneves was the fastest qualifier on Saturday (228.919 mph) and will be last to make a run today.

Dixon, in the No. 9 PNC Bank Chip Ganassi Racing Honda, is a three-time pole sitter, including last year. Ed Carpenter, driver of the No. 20 Ed Carpenter Racing Fuzzy’s Vodka Chevrolet, won the pole in 2013 and ’14 and was second fastest on Saturday. Others competing in the Fast Nine Shootout today are Simon Pagenaud, Will Power, Sebastien Bourdais, Spencer Pigot and Josef Newgarden.

All 33 drivers must make a qualifications attempt today. The speeds from Saturday are erased.

Live coverage of the day is available on WatchESPN from 2:30-4 p.m., before it shifts to ABC’s national TV broadcast from 4-6 p.m.