Day decided during last season's FedEx Cup playoffs that he needed a change on the course. He and Swatton, who has served as his coach, mentor and caddie since he was a teenager, decided to find someone else to carry the bag.
Day began using Australian friend Luke Reardon, but Reardon has had visa issues and has been unable to join Day in the United States. His next choice was David Lutterus, but he had visa problems.
He then enlisted Batisbasaga, a professional golfer who Day said he has known since they were young kids in Australia.
"Either grab him or grab someone out of the crowd," Day joked.
"I kind of threw him into the deep end quick," he added.
The pair did just fine. Following Thursday's 1-over 73 -- the same score Day shot in his first round of the 2015 Farmers win -- Day fired an 8-under 64 on the North Course in the second round, and shot 71 on the South on Saturday. He battled the winds to notch an impressive 70 on Sunday to get to 11-under total with Noren and Ryan Palmer.
One of the key holes was the par-3 third, where, in howling wind, Day made a 2 while watching playing partner CT Pan suffer an 8.
He also made a nervy 10 1/2-foot putt for birdie on the first playoff hole to stay alive when Noren had knocked his approach to 18 inches.
On Monday morning, Day said he intentionally practiced wedge shots between 75 and 85 yards in case he had to lay up. He said he may have been fortunate to have not hit the fairway on 18, while Noren felt like he had to go for the green because he had "perfect" yardage for his 3-wood.
"I thought it was going to reach," Noren said of his approach. "I mean, it's tough in that first cut because it gets a little more spin than off the fairway. Tough luck."
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