"We don't have anybody in the Top 10," Querrey said, "but Mardy Fish is playing great right now.... I think after the Open we could have four guys in the Top 20, which we wouldn't have [had] in a long time."
The historic absence of Americans from the Top 10 stems from Andy Roddick's fall from No. 9 to No. 11 this week—Roddick lost his second-round match in Washington after reaching the final last year. After saying he felt "lethargic" during the defeat and planned to undergo medical tests, Roddick pulled out of this week's Toronto Masters with an unknown illness.
But Querrey feels that Roddick could quickly regain lost ground.
"Andy is ranked 11," said the younger American. "Great tournament next week, he can squeak back in.
"You could argue that the first three months of the year was one of the best starts that he's had in five years," added Querry, referring to Roddick reaching the quarterfinals at the Australian Open before making the final of the BNP Paribas Open at Indian Wells and winning the Sony Ericsson Open in Miami.
"So I think he's playing well, and Cincinnati and the U.S. Open are usually two of his best tournaments. I think there's a good chance he's going to get himself back in the Top 10 after the U.S. Open."
Querrey himself is targeting a rankings rise in a season in which he has won three smaller 250-point events but not had the same success at the bigger events with more rankings points.
"You've got to organize your schedule to make sure you're not tired going into the bigger events like, you know, like this and the Grand Slams," Querrey said. "Even though the 250s don't necessarily do anything for me [rankings-wise] right now, they're still getting matches under my belt, still getting wins and confidence.
"After the U.S. Open I'm playing Beijing, Shanghai, Basel and Paris... two 500s and two 1000s, so there's no more 250s on the schedule for me after the U.S. Open."
Querrey's latest victory at a 250 event was in his hometown event at Los Angeles two weeks ago. In the final, he scored a win over world No. 4 Andy Murray for the first time with an impressive display of shot-making and competitive mettle over three sets, which boosted his belief that he could make a run at the Top 10 himself.
"I actually rewatched the match later that night on TV and I played great," Querrey said. "Just every time you can beat a Top 10 guy or a guy you've never beaten before is just going to give you a little more confidence going to the next set of tournaments or even the next time you play a Top 10 guy."
