In the same four-week span, top-ranked American Andy Roddick has played just 55 minutes of competitive tennis.
So it was understandable, when the big-serving pair met Thursday at Washington's Legg Mason Tennis Classic, that Querrey was the sharper player.
But on this night, as so often in life, experience compensated for any momentary shortcoming.
After bringing the crowd of nearly 7,000 at the William H.G. FitzGerald Tennis Center to a hush by getting broken in two of his first three service games, Roddick rallied, 7-6 (4), 6-4, to earn a spot in tonight's quarterfinals.
He'll face another big server, Ivo Karlovic of Croatia, who advanced earlier by halting out the charmed progression of two-time NCAA champion Somdev Devvarman, 7-5, 6-1.
Roddick's victory over the 6-foot-6 Querrey, whose potent serve and forehand mirror his own, was the 500th of his professional career. Among active men's players, only three men have won more matches: Roger Federer (657), Carlos Moya (573) and Lleyton Hewitt (511).
At 26, Roddick is the youngest of that elite bunch. And he declared himself humbled by the number and the company.
"It's a nice validation of maybe the consistency I've been able to have," Roddick said. "And I think I got there with enough time to add to it significantly."
But on another level, it represented something more: that Roddick has turned the page on the five-set loss to Roger Federer, in which he came so close to the second major title he has coveted since winning the 2003 U.S. Open.
He is hardly back to the form he was one month ago. Roddick served just three aces in the match while double-faulting six times.
But when a serve went awry or a volley found the net, Roddick wasted no time berating himself, as he often did as a younger player.
He kept his mind on the task at hand and stuck to his game plan - moving Querrey around the court to better exploit his lack of mobility, varying the pace of his stroke to keep his opponent from getting into a groove, and respecting Querrey's mighty forehand.
As a result, the momentum shifted Roddick's way after he broke Querrey a second time in the opening set.
"I've been able to get over stuff a little faster on court and stay the course," Roddick explained, more pleased with his resolve than with any particular stroke. "When I broke back a second time, I said, 'This is my set to win now.' "
Earlier Thursday, Juan Martin del Potro, the tournament's defending champion, survived a spirited challenge from Australia's Lleyton Hewitt before advancing, 4-6, 6-3. 7-6 (2).
Del Potro will face Sweden's Robin Soderling, who beat Marc Gicquel of France, 4-6, 6-3, 7-6 (2), in the quarterfinals.
Tommy Haas, 31, was first to advance to the final 16 Thursday, shaking off a mental lapse against Juan Carlos Ferrero of Spain to prevail, 7-5, 2-6, 6-1.
With the match level at one set apiece, Haas made quick work of the final set, racing to a 5-0 lead before Ferrero mustered a game.
It was significant victory for Haas, whose career has been halted by injury more times than he can count.
He'll face Fernando Gonzalez of Chile, who breezed past American Wayne Odesnik, 6-2, 6-4.
NOTE: : Two dozen Washington-area youngsters showed off the skills they have learned this summer through the U.S. Tennis Association's Quick Start program, which teaches basic skills of the sport on smaller courts, with bigger tennis balls and smaller racket frames.
Washington Mayor Adrian Fenty was on hand, along with officials from the U.S. Tennis Association, to announce that the program will be expanded from three pilot programs to 11 after-school programs throughout the city.