-11 B Van Pelt (US) -10 F Couples (US), C Knost (US), P Casey (Eng), T Armour III (US) -9 R Karlsson, J Bohn (US), L Westwood (Eng), R Moore (US), J Byrd (US), G Ogilvy (Aus)
Van Pelt was looking strong before fading light halted the golf
Bo van Pelt grabbed the lead by one shot in the third round as darkness again brought an early end to proceedings at the Houston Open.
The American finished the day on 11 under after eight holes, with Fred Couples, England's Paul Casey, Colt Knost and Tommy Armour chasing hard.
Sweden's Robert Karlsson, England's Lee Westwood and Australian Geoff Ogilvy are a shot further back on nine under.
Ireland's Padraig Harrington was among half a dozen players at eight under.
Van Pelt, without a win in more than eight years on the PGA Tour, completed a second-round 67 on Saturday, then birdied three of the first seven holes in his third round.
Knost had led the field until a three-putt bogey at eight, while Casey, who shared the second-round lead at eight under, birdied the par five fourth and holed a 37-footer at the seventh.
Westwood looked in hot form, finishing the day with five birdies and a bogey, include three birdies in a row between nine and 11.
Northern Ireland's Rory McIlroy, preparing for his Masters debut next week, did not have the best of days with a second-round 73 and then dropped another two shots to fall to two under after 16 holes.
England's Justin Rose also disappointed with a two-over 74 earlier in the day, before ending his Saturday's third round on two over - level par for the tournament - after 15 holes.
The third round will resume later on Sunday, with the final round to begin immediately afterwards.