The United States took a 3.5-1.5 lead over the global team on the opening day of the Presidents Cup as they chase a seventh consecutive title.
"I just love every opportunity to be a part of these events and on these teams", said Mickelson.
Their match was all square on the 18th hole Friday.
"He drives it like a stallion and putts even better than that. pulling out the best golf in me", Mickelson said.
FedEx Cup champion Justin Thomas and Rickie Fowler routed Charl Schwartzel and Hideki Matsuyama, despite the worldwide pair going ahead with a birdie at the par-five second.
For Mickelson it was his 24th Presidents Cup victory, tying him with Tiger Woods for the most all-time, as the five time major winning hailed the team as the best he has ever seen.
USA captain Steve Stricker rewarded Mickelson with a rest, sitting him out of the afternoon four-ball matches.
In a tense match which went to the 17th hole, South African pairing Louis Oosthuizen and Branden Grace took the first win of the day for the worldwide team over Koepka and Daniel Berger, winning 3-and-1.
The International team, comprised of players from around the world except for Europe, have lost nine of the 11 competitions and Price said it was hard to come together as a team.
In the opening match in New Jersey, Justin Thomas and Rickie Fowler beat Charl Schwartzel and Hideki Matsuyama 6&4.
The only positive for the worldwide team was a victory for Louis Oosthuizen and Branden Grace, who maintained their 100 per cent record as Presidents Cup partners.
Jordan Spieth and Patrick Reed contributed a half point to the US effort when their match with Hideki Matsuyama and Canada's Adam Hadwin ended all-square.
The shortest match of the day belonged to a pair of American rookies, Kevin Chappell and Charley Hoffman, who sat out the foursomes matches in the opening session.
Dustin Johnson and Brooks Koepka, close friends and the last two U.S. Open champions, took their first lead on the par-3 10th with Koepka's birdie, and Johnson showed rare emotion on his final two birdies in a 3-and-2 victory over Adam Scott and Jhonattan Vegas.
The Americans have a 9-1-1 lead in these matches, their lone loss in 1998.
"It gave us a little more fire and momentum going into today".
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