Mickelson made it clear to Woods that he didn't have to accept, but the 14-time major champion said: "So you think you can make birdie on the first hole?"
Both birdied the par-5 18th and then parred the first playoff hole before it went to the par-3 extra hole - which was pitch shots off the practice putting green - that they kept playing until there was a victor. He always drops the big picture and it's the trump card.
That gave Mickelson a chance to win the hole on the par-3 17th hole (there was no side-bet challenge).
Mickelson did have a putt for birdie on the first, but he hung it out to the left, and Woods was on the board for $200,000, which was donated by Woods to the Tiger Woods Foundation, After that, Mickelson won three closest to the pin competitions as Nos.
Mickelson had several putts to win earlier in the match that failed to drop, but he made no mistake on the final go at the par-three, 93-yard hole for the winner-take-all triumph.
Woods struggled with his putter all day.
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"He does this crap to me all the time - for 20 years" said Mickelson. Woods drew even when he got up and down for a birdie from just over the short par-4 11th hole, then held his only lead when he knocked an approach shot stiff at the 12th hole to go 1-up. "Lo and behold, here we are going to extra holes and we're under the lights".
Both players were miked up for the entire round, giving fans a rare insight into discussions between themselves and their caddies, but it was the unmistakable tones of Samuel L. Jackson introducing them that was the first sign of what was to come. Woods's last major was in 2008; Mickelson's was in 2013. After he pitched out his third shot, Mickelson missed his long birdie putt. It was one of numerous poorly-hit putts by Woods throughout the day.
After the two most popular golfers of their era hit their opening tee shots at Shadow Creek, they set off for what proved to be an underwhelming round in which both failed to deliver the highlight reel-type shots that have defined their careers.
They then went to the makeshift playoff hole, where a tee was put on the putting green and measured 93 yards to a new hole cut on the 18th green. That's how good I feel heading into this match.
While the pay-per-view event was priced at $19.99, promoters chose to offer it free online at some point during play because of what they described as technical issues that impacted user access.