Speaking after qualifying in Las Vegas, Vowles told Sky Germany: “I think as far as Logan is concerned, he has matured a lot in the last four races. He has made fewer mistakes and is building it up bit by bit.
“Nobody has driven a lap here yet, so he has less of that rookie status. He has now built up more and more trust in the car. Today almost every lap he drove was on par with Alex.”
Vowles: I want more from Sargeant
Sargeant recorded his best qualifying position of the year in Vegas, putting his Williams in seventh place, with teammate Albon in sixth – both being promoted one place up the order following a penalty to Carlos Sainz.
The pair managed to avoid the first lap chaos and hold position, but the cold track conditions meant they struggled with tyres later in the race and Sargeant finished in 16th, with Albon in 12th.
When asked about Sargeant’s future, Vowles said: “I still haven't changed my perspective. I will make my decision at the end of the year.
“He's on the right track, but I want to see more progress.”
Williams currently sit seventh in the constructors’ championship heading into the final race of the season in Abu Dhabi.
The zero points finish in Las Vegas means they are seven points ahead of AlphaTauri, who are in turn five points ahead of Alfa Romeo.
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