Spieth, the 2015 Masters Champion, is at even-par for the tournament, seven shots behind the leaders.Francesco Molinari, Jason Day, Brooks Koepka, Adam Scott and Louis Oosthuizen are in a five-way tie for the lead.
Players were greeted by steady rain as play began on Friday but the skies cleared allowing over half of the 87-player field to complete their rounds before action was halted.
McIlroy got his round under way with a flawless drive and an approach to 25 feet but left his birdie putt inches short and then strangely opted to hit a three wood off the tee on the par-five second.
One hole earlier, a pinpoint chip to set up birdie had drawn with one shot. When he mounted the 18th tee here 28 years ago, he picked out his Persimmon driver and smashed his tee-shot clean over the left-hand bunker. He was only seven shots behind, but he had 35 players in front of him.
Scott returned from a 40-minute weather delay and fired a 231-yard second shot into the par-5 15th hole. "This is now three straight majors that I've been in the mix and so it's good stuff".
Tony Finau threw his hat into the Green Jacket ring on Saturday, stealing the early third round lead at the Masters with a record-equalling outward nine to jump to the top of a leaderboard packed with major winners.
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"It was fun", Woods said after the round, before saying he was confident on how he was striking the ball ahead of the weekend. For none of them, ultimately, go gentle into that good night.
It worked wonders as he appeared to be in considerably less pain while putting together a round that was almost flawless, although Day said his wife Ellie deserved just as much credit for his remarkable recovery.
Woods' round took an interesting turn on No. 14.
Day defied crippling back pain to be in contention after the first round - somehow posting a 2-under par 70 to finish day one just four shots from the lead despite aggravating his chronic back injury and needing medical treatment just five shots in.
Justin Hading, who surged to the top of the leaderboard for much of Round 1, was still in the hunt at six-under par.
"Accidents happen, we move on", Woods said of the incident, confirming he suffered no major damage from the guard's boot.