He chipped from the rough and missed the green but was able to get up-and-down for par.
Mackenzie Hughes, who shot a first-round 60, had a 67 to tie for third with 23-year-old Will Gordon at 17 under. Hughes made 48-foot birdie putt on 17, which he started well left of the hole and watched as turned right to the flag.
How it happened: Johnson quickly erased his two-shot deficit to start the round and staked himself to a two-shot lead of his own with three straight birdies at Nos.
But Streelman missed long birdie chances on 17 and 18, and after Johnson safely parred the 17th, he made par on the 18th to seal the win. His third-place finish was just enough to earn him a special temporary card and unlimited exemptions for the rest of the season.
"I knew the higher the better, so I was watching the leaderboard coming in, " he said. It marked his career low in 918 career rounds on the Tour, and he entered the final round trailing 54-hole leader Brendon Todd by two strokes. He looked to have taken an unassailable grip on the lead when Todd, who opened with 11 consecutive pars, fell out of contention at the 12th. Johnson had to take off his shoes and stood in the water to play his second shot at the par 4, but escaped with par.
Former world No 1 Johnson bagged his first tournament win since February 2019 after a closing three-under-par 67 at TPC River Highlands in Cromwell, Connecticut.
Top-ranked Rory McIlroy tied for 11th at 13-under after a 67. "There's been some really good stuff in there, but then just some really stupid mistakes".
"I'm looking at this week as progress, " he said.
Fritelli missed the cut when the tour restarted with the Charles Schwab challenge but rallied to finish in a tie for eighth at the RBC Heritage at the Harbour Town Golf Links in SC. Johnson is a Teflon Man who shows little reaction when he plays, but when asked on Saturday if he ever felt stress on the course, he replied, "A lot more than you think I do". "Like I hit the putt on 17, that was a putt that would just make people erupt, the way it was a pretty dramatic putt".
There were seven COVID-19-related withdrawals from the CT event, with two positive tests among players.
Frittelli becomes the fourth PGA Tour professional to test positive for coronavirus after Nick Watney, Cameron Champ and Denny McCarthy, while Brooks Koepka and Graeme McDowell both pulled out of the Travelers Championship after their caddies were also found to have contracted Covid-19.
Dylan Frittelli has been withdrawn from the upcoming Rocket Mortgage Classic after contracting coronavirus, the PGA Tour announced.
"We're making several adjustments to our health and safety plan as noted in the memo sent to players this morning, and we will continuously reinforce to all players, caddies, staff members and support personnel on property at PGA Tour events to adhere to social distancing and other safety professionals that further minimize risk".