Spieth and Johnson, between them winners of two of the past three British Opens, headed Britain's Rory McIlroy by one stroke as the cream quickly rose to the top on the TPC River Highlands course in Cromwell, Connecticut.
Brian Harman shot a 4-under 66 on Friday to move to 10-under par and then watched that hold up for the second-round lead in the Travelers Championship, thanks in part to a 10-second rule.
"That felt great", Johnson said.
"When those words were spoken on the green at Birkdale, it just kind of hit me".More news: Lionel Messi to get special gift from Moscow
"I feel like there are good scores coming", Spieth said. "I've been working on some things on the swing, just made a decision to play toward the center of the greens and let the putter do the work because it's starting to come around".
Jones hit 16 of 18 greens for the second consecutive day, following up his first-round 65 with a 66.
It was another frustrating day for Jordan Spieth, however, less than 24 hours after his blistering 63 gave him a share of the overnight lead with Zach Johnson, who was among the afternoon starters with Padraig Harrington and Graeme McDowell.
Defending champion Spieth blasted out of a bunker 31 feet for eagle at the par-five sixth, evoking memories of the bunker hole-out the United States star hit past year in a playoff to win the event at TPC River Highlands in Cromwell, Connecticut. Spieth said that his putting has improved and that he is more comfortable. I know Sergio had a pretty good look to win the tournament in regulation. "That's as good an up and down as I've ever witnessed or performed".More news: Eurogroup reaches agreement on final loan and debt relief for Greece
Watson carded a seven-under-par 63, highlighting his performance with a three-foot birdie at the final hole at TPC River Highlands after nearly sinking his approach. Both shot 7-under 63. Watson jump started his round with an eagle on his third hole, the par-5 13th.
"I hit one out-of-bounds past year", he said. "Today I started out hotter". Beat the field by at least a shot. He went out in a blistering four under 31, complete with an eagle on the sixth hole.
"I've seen the shot a lot of times, especially the couple weeks after the golf tournament". "It's fun playing with good friends". There are some holes you can get at. "I was having a hard time, not getting motivated, but just getting focused", Thomas said. I'm starting to kind of even things out now.
Spieth, buoyed by a 30-foot eagle from a bunker at the par-five sixth, was almost flawless apart from a bogey at the par-four 15th, where he hooked his tee shot into a pond that was so far left it surprised the group waiting on the nearby 16th tee.More news: How to watch Iran vs