CARMEL, Ind. — Roberto Castro wants nothing more than to go home to Atlanta, and he took a soggy step in the right direction Thursday in the BMW Championship.

Castro was just as good before the rain as he was after the storms cleared at Crooked Strick, running off eight birdies until a bogey on his last hole for a 7-under 65 and the temporary lead.

Storms and heavy rain caused a 3 1/2-hour delay and changed the nature of Crooked Stick from fast and firm to greens that were soft and accessible. The delay meant that just under half the 69-man field finished the round.

The first round was to resume at 8 a.m. Friday, with more bad weather in the forecast.

Brian Harman got right back into gear. He was in position to potentially lock up his spot in the Tour Championship until closing with a 77 from the final group at the TPC Boston on Monday. He opened with a 66, with an eagle on the par-5 15th hole and no bogeys on his card.

U.S. Open champion Dustin Johnson was within one shot of the lead until he sent his drive into the lake to the right of the 18th fairway and made bogey, giving him a 67 along with Jason Dufner.

Among those still on the course, Chris Kirk was at 5 under at the turn, while Hideki Matsuyama, Paul Casey and Adam Scott were at 4 under on the back nine.