Fowler is coming off a missed cut in the Farmers Insurance Open, but he had finished in the top 5 in four of his last five prior to that. Over the years it has produced a catalogue of memorable moments, including that stunning Tiger Woods hole-in-one 21 years ago, which is one of nine aces on the 16th.
Haas made five putts outside of 12 feet, including a 19-footer for eagle at the par-5 15th, a 29-foot birdie at the par-4 second and a 14-footer par save at the par-4 11th.
The Phoenix Open is the best-attended tournament on the tour and is known for its rowdy atmosphere, especially at the par-three "Coliseum" 16th hole, which is surrounded by stands that can house 20,000 fans. See you soon! It was Griffin's last tweet.
Spieth - victor of three majors - holed four bogeys to go with three birdies as he struggled for consistency on day one of the event. After some stops and starts, the tournament has been held continuously since 1944 and at its current location since 1987. Spieth placed ninth in this tournament previous year. "So we have been working on the putter all week and ball striking stayed pretty consistent, so if I can get the putter to get a little warm tomorrow, then we'll be set up for a good year".
Hideki Matsuyama, a playoff victor over Fowler in 2016 and Webb Simpson previous year, had a 69 playing alongside his two sudden-death opponents.
When Byeong-Hun An played here for the first time previous year and finished T6, it backed up the idea that if you play well in one desert, you can play well in another - even it's on the other side of the world.
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Fowler is now the +550 favorite just ahead of Rahm at +700 (Rahm is three back of Haas).
The par 3 16th hole at the Waste Management has taken on a life of its own, with its unique stadium environment that accommodates up to 16,000 spectators.
World number two and Spaniard Jon Rahm is a stroke further back at four under following his opening-round 67.
"It's going to be kind of weird to play with them on Thursday and Friday", Matsuyama said. His three victories are tied with Littler, Arnold Palmer and Mark Calcavecchia.
Scotland's Martin Laird is four shots behind Haas on three under.