Oosthuizen faced a birdie putt on his penultimate hole when play was suspended late on Thursday evening, a legacy of a 90-minute fog delay earlier in the day.
Tweet of the day
Bryson DeChambeau won last year's US Open, but his arch rival Brooks Koepka apparently did not see any of it.
Quote of the day
Russell Henley had low expectations ahead of round one, but carded a superb 67.
Shot of the day
Richard Bland completed his first hole in the US Open since 2009 in some style.
Round of the day
Not the lowest round of the day, but certainly the most remarkable one from Matthew Wolff, who had just five pars, eight birdies, three bogeys and two double bogeys in his 70.
Statistic of the day
The par-five 18th was the easiest hole on day one, playing to an average of 4.616 and yielding seven eagles and 55 birdies.
The par-three 11th was the hardest hole, giving up just five birdies and playing to an average of 3.429.