Brooks Koepka and Charl Schwartzel equalled the lowest score in tournament history as the 100th US PGA Championship turned into a shootout in St Louis.
Koepka's 63 left the double US Open champion two shots off the clubhouse lead held by fellow American Gary Woodland, whose 10-under-par halfway total of 130 established a championship record.
Woodland enjoyed a one-shot lead over compatriot Kevin Kisner, who bogeyed the last to shoot 64, with Schwartzel three off the lead alongside world number one Dustin Johnson and Thomas Pieters after eight birdies and a bogey in his 63.
Thunderstorms then forced play to be suspended mid-afternoon and later abandoned for the day, with the second round set to resume at 7am local time (1pm BST) on Saturday. Tiger Woods had completed seven holes in three under par, with playing partner Rory McIlroy carding seven pars.
Tweet of the day
Eddie Pepperell was sorely tempted by the drink options during the suspension of play, tweeting a picture of a fridge full of wine and beer.
Shot of the day
Gary Woodland put his power to good use on the par-five 17th, hitting a stunning approach from 265 yards to five feet to set up an eagle three.
Round of the day
Both Brooks Koepka and Charl Schwartzel shot 63 to equal the lowest score in tournament history, but Koepka just edges it on account of carding seven birdies and no bogeys.
Quote of the day
"I think May is going to be a lot better for this golf tournament for sure." - Frustrated by the conditions, Jordan Spieth gives his approval for the tournament's schedule change from 2019.
Stat of the day
The Golf Channel's Justin Ray highlights how good the scoring was on Friday, tweeting that it was only the second time in major championship history that there were two scores of 63 in the same round.
Toughest hole
With half the field yet to complete their rounds, the fourth hole was playing as the toughest, a 520-yard par four which is a par five for the members. Only six birdies, 41 bogeys and two double bogeys resulted in a scoring average of 4.368.
Easiest hole
In stark contrast, the 132-yard third hole played to an average of just 2.563 thanks to a favourable front pin position which saw 55 birdies and no bogeys from the morning starters.
On the slide
Paul Casey's grip on an automatic Ryder Cup qualifying place after a missed cut left him vulnerable to being overtaken by Denmark's Thorbjorn Olesen.
On the up
The chances of a home winner with nine Americans in the top 15, including leader Gary Woodland, double US Open champion Brooks Koepka and world number one Dustin Johnson.
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