With three rounds of the Waste Management Phoenix Open in the books, and Xander Schauffele are tied at 18 under.
Spieth caught fire Saturday, carding a 10-under 61—the best single-round of his career—to rocket up the leaderboard. Schauffele led Steve Stricker and Keegan Bradley by one shot heading into the day, and his six-under 65 helped him keep pace with Spieth.
Having missed the cut at the Farmers Insurance Open, Spieth put together two solid rounds at TPC Scottsdale. He explained Friday how his confidence was "probably higher than it's been in a long time."
"Still certainly not at 100, not feeling like I have my A-game, but I feel like it's trending that direction, which gives me a lot of confidence," the three-time major winner told reporters.