Woods suffered his third loss of the week in Saturday's fourballs alongside Steve Stricker - beaten on the 18th by Sergio Garcia and Luke Donald - after being left out of the morning foursomes; something that had never happened before in his Ryder or Presidents Cup career.
That was the former world number one's 17th loss in the biennial event, matching the total of Mickelson, who famously lost twice on the opening day at Oakland Hills in 2004 when paired with Woods by US captain Hal Sutton. Europe won then by a record nine points.
Woods insisted he was "absolutely" fine with current captain Davis Love's decision to leave him out on Saturday morning, adding: "It was nice to be fresh, no doubt.
"This is a long grind to go all five. I've done it before and it's hard. I felt great this morning [Saturday] and it was nice to kind of sleep in and get a little bit of rest.
"I watched the guys on TV and tried to get out here and watch them a little bit (but) captain says, 'Hey, it's cold out here, stay inside, stay warm and be ready for your match'."
Love even rested Mickelson and Keegan Bradley despite them enjoying three wins out of three - the last a record-equalling 7&6 foursomes thrashing of Donald and Lee Westwood - and Woods added: "That was the plan going into these matches (to rest everyone at some point).
"I put so much effort into that last match yesterday afternoon [Saturday], and I was pretty spent. This is way different than Presidents Cup when you have it over four days. Five matches in three days is a lot, and hey, I'm not young anymore. I'm one of the older guys."
Asked about his form, Woods added: "I've played well the last two afternoons and didn't get a point. It's tough. Yesterday [Saturday] I made a bunch of birdies and today [Sunday] I made five on the back nine and it just wasn't enough.
"[I'm] feeling good about my game but just unfortunately haven't got a point. Yesterday [Saturday] I played terrible in the morning, really, really struggled. [I] turned around in the afternoon and unfortunately we ran into a guy (Nicolas Colsaerts) who made more putts than anyone I've ever seen."