Cabrera and Pettersson shot 7-under 65 in calm conditions Thursday morning to set the pace before the first round was suspended by a thunderstorm.
Only 51 players completed play before the horn sounded at 1:27 p.m. Tournament director Steve Timms said the storm dumped about 1 1/4 inches of rain, leaving shallow ponds on many of the fairways.
Grounds crews fanned out across the course late in the afternoon, and Timms was optimistic that Redstone would be playable when the first round was scheduled to resume at 7:30 a.m. on Friday.
Ricky Barnes and Jeff Maggert completed their rounds in the morning and were one shot off the lead. Brian Harman also was 6 under, but had three holes left.
Defending champion Phil Mickelson, Fred Couples and Ernie Els, who needs a victory to qualify for the Masters next week, were playing their front nines when play was suspended.
SCIACCA, Sicily (AP) — Ireland's Peter Lawrie shot an 8-under 64 at Verdura Golf and Spa Resort to take a one-stroke lead after the first round of the Sicilian Open.
Wales' Jamie Donaldson, Denmark's Soren Kjeldsen and Argentina's Tano Goya were tied for second. John Daly opened with a 71, and Italian teenager Matteo Manassero had a 71.