Race to Dubai challenger Justin Rose also carded a 70 to lie just two shots off the lead in a tie for fourth with American Julian Suri and Thailand's Kiradech Aphibarnrat.
Rose needed to finish at least solo fourth, but the ensuing birdie only gave him a tied fourth place at 17-under par.
"Today was pressure in a different way", said Fleetwood, who has a lead of 256,738 points over Rose. He is doing everything he has to do and I'm doing the same, so it's perfectly set up for Sunday.
"I've got nothing to lose", the 23-year-old said. Does that change now?
Arabs unanimously agree on rejecting Iranian approach
In the interview , Eisenkot called Iran "the biggest threat to the region" and said Saudi Arabia was in "complete agreement". Gulf Arab countries are also anxious about the Islamic republic's support for Huthi rebels in Yemen.
Rose withstood a stiff test of his nerve by Fleetwood who, after a poor first day, has fought back with successive 65s, including eight birdies in his last 11 holes on Saturday. Last week: Branden Grace won the Nedbank Challenge.
"I've kept myself in with a chance of the tournament but it's only a big round if I keep it going". I was in contention in the US Open and in (the WGC event) in Mexico, but they were like one or two rounds.
"A year and a half ago I was absolutely nowhere in the game, I was a bit lost".
Rose is hoping to win the Race to Dubai - the season long moneylist - as a victory would enable the South African-born player to claim the season-long title. This is a different pressure to Wentworth previous year (the BMW PGA Championship) when I didn't want to play because I was scared I would not get it off the first tee.
Cold front brings rain and wind Saturday night
Mountains of Southeast West Virginia, Southwest Virginia and Northwest North Carolina, as well as the Virginia foothills. If we do see this line of convection materialize there could be wind gusts up to 60 miles per hour .
Rose saved par on the last despite taking a penalty drop, pitching to seven feet and rolling in a testing right-to-left putt for par which kept him one clear of Frittelli, who had birdied four of the last five holes in a flawless 63.
Overnight leader and defending champion Matthew Fitzpatrick shot a level-par 72 to drop back in the field.
"On the course has been great, I've played some of the best golf of my career and done things that I've never done before".
Grigor Dimitrov Triumphed in the Final Season Tournament in London!
The resilience that allowed Sock to come from behind and win the first set was nowhere to be seen in the second. His unforced errors were flying all over the court and Thiem snatched an easy break and quickly led 3-0.