England's Lee Westwood shared a three-way lead of the Indonesian Masters at the end of a weather-affected day two.
Tied at nine under with Shaaban Hussin and Hyun-bin Park, Westwood was five under for the round after 16 holes before lightning threats stopped play.
Westwood, 37, could replace Martin Kaymer as world number one if he wins.
But fellow Briton Luke Donald could overtake him and Kaymer by winning The Heritage in the United States, where he is three off the lead after day one.
World number two Westwood will have to return at 0630 local time on Saturday to finish the last two holes of his second round at the Royale Jakarta Golf Club.
Converting to a conventional putter on Friday, Westwood birdied his opening four holes before making the turn in 32.
He added a birdie and bogey on holes 12 and 13, respectively, before recording a birdie the 16th just before play was suspended.
"Obviously I'm disappointed because I had two more holes to play" said Westwood. "I'm still in contention and have to see how things go in the next two days."
On Twitter, he added: "Good day on the links. Opened with four straight birdies - but got to say I hate not finishing!"