INDIANAPOLIS -- Three-time Indianapolis 500 Helio Castroneves withstood a late afternoon charge from two-time Indy pole winner Ed Carpenter to hold onto the top seed in Sunday's nine-car pole shootout.
All 33 starting spots on the grid will be determined Sunday.
Castroneves posted a four-lap average of 228.919 mph on the fourth attempt of the day then waited through two rain delays and 43 runs.
Carpenter bumped his way into the 33-car field with an average of 228.692 -- second-fastest of the day. His two teammates, Danica Patrick and Simon Pigot, also made the shootout.