South Korea’s Tom Kim has held onto his lead as Ireland’s Shane Lowry and Scotland’s Robert MacIntyre both shot into contention in a weather-affected second round of the Travelers Championship.

“[I’m] not really thinking about the score,” said Kim. “I’m playing really well and I know kind of what I’m doing on the golf course, so just really executing my game plan, that’s just kind of how I’m doing it, and the score is the score. I’ve been playing really, really solid, and I’ve been saying the past few minutes that it’s not about this week, it’s about keep building these momentum blocks for the rest of the season.”

On his 22nd birthday, Kim added a 65 to his opening 62 to reach 13-under-par at the halfway stage at TPC River Highlands.

Kim, who had a faultless round with five birdies, said the work he has been doing over the past few months has made him feel confident among the strong competition.

“I think this stretch is making me more sharper and more ready and I think it’s kind of time to show,” he said.

World number one Scottie Scheffler marked his 28th birthday with a 64 to sit two strokes back, alongside Collin Morikawa and Akshay Bhatia after a three-hour delay due to lightning in the area.

“After the delay I came out and hit some really nice shots,” said Scheffler. “It was nice to birdie 18 to finish. Before that I feel like I played a lot of solid golf and did some good things, so overall it was I think a pretty solid day.

“I found a little stuff in my swing and feel like I’m seeing the breaks a lot better on these greens. Definitely feeling some good momentum from the last two days.”

Xander Schauffele is a shot further back, one clear of a group which includes Lowry, who included six birdies and an eagle in his eight-under-par 62.

That was matched by MacIntyre, who birdied his last two holes to sit a shot further back.

Related: Mikko Korhonen takes 36-hole lead

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