It's not uncommon for a PGA Tour player to make consecutive birdies in a round. Two in a row isn't that hard to pull off. Three in a row is a bigger deal, but it's still fairly common. Four in a row happens a bunch of times per year.
So, what's the record for the most consecutive birdies on the PGA Tour? Believe it or not, the record doesn't belong to any of the eight players to shoot 59 or less in PGA Tour history.
Mark Calcavecchia is the player who made the most consecutive birdies in PGA Tour history, carding nine consecutive birdies from holes 12-2 (playing back to front) in the second round of the 2009 RBC Canadian Open. He eclipsed the prior record of eight birdies in a row by eight different players.
That streak, however, is birdies only. There are three players in PGA Tour history that have played eight consecutive holes with a birdie or better (eagle or albatross). Billy Mayfair and Briny Baird made seven birdies and an eagle in the 2001 Buick Open and at Disney World in 2003, respectively, while Ryan Palmer made six birdies and two eagles in an eight-hole stretch at the 2015 CareerBuilder Challenge.