Sydneysider Jones, who began his round on the 10th, couldn't rediscover the first-round radar with his approach shots, but played some exquisite chips and clutch putts around several greens to maintain his challenge.
"I'm one-for-one defending titles, so that's a pretty good stat", Berger joked after securing his second PGA Tour victory at the age of 24.
But Mickelson closed with two bogeys, a birdie and a double bogey at No. 9 to finish at 4 under par, five behind co-leaders Chez Reavie, Charl Schwartzel and Sebastian Munoz.
Thornberry shot a 65 and became the first amateur to finish in the top 10 at the St. Jude Classic since 1965.
They were one stroke in front of overnight co-leader Stewart Cink, who carded a 68 for 132, with Ben Crane, victor of this tournament in Memphis, Tennessee, on 133 after a 65.
Schwartzel shot a woeful 4-over 74 Saturday, but bounced back with a 4-under 66 in Round 4.
"The key to my round today was the key to anyone's round who plays well here and that is you've got to keep the ball in front of you", said the 44-year-old. Playing out of the penultimate twosome, he mustered six (of 14) fairways and 11 greens in regulation, losing 0.554 strokes tee-to-green and 1.770 on-the-green.
CT 2017: Waqar Younis lashes out at Eoin Morgan for pitch complaint
Fakhar Zaman's 57 launched Pakistan's chase, while Azhar Ali made 76 as victory was sealed with 12.5 overs to spare. But, you still have to play your best on a number of different surfaces if you are going to win a major tournament.
At one point, there were nine players tied for the lead at 8-under before Berger finally emerged from the pile.
CAMBRIDGE, Ontario - Ariya Jutanugarn was seated by the scorer's tent after finishing her final round Sunday, snapping selfies with In Gee Chun and thinking there was little chance they would return to the course for a playoff at the Manulife LPGA Classic.
Adam Scott's last drive of the day was the best at 18.
The South African finished seventh at the U.S. Open at Chambers Bay two years ago and looks good so far in his prep for Erin Hills next week.
Jutanugarn shot 3-under 69 and was tied with Thompson (72) and Chun (70) at 17-under 271.
Three dropped shots in the first five holes had him on the backfoot early on, though birdies at eight and nine, plus a level-par back nine saw him card at one-over par round of 71.
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