Matt Kuchar has opened up a one-shot advantage at the Crowne Plaza Invitational at Colonial.
The American moved to 10-under-par with three holes of his second round remaining, before play was suspended due to darkness.
Canada's Graham DeLaet is in second place on nine-under-par, while four players, including first-round leader Ryan Palmer, lie a shot further adrift on eight-under.
Sweden's Freddie Jacobson is on seven-under, with Brian Davis leading the English charge on five-under.
