Sam Querrey credits good vibes with his resurgence this season.

The Wimbledon semifinalist says a small change has made a major difference in his season.

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For the first time in his life, Querrey is playing without a vibration dampener in his racquet.

“My backhand, in general, feels really good,” Querrey told Tennis Channel’s Leif Shiras. “I’ve really been committing to playing aggressive the entire year and this is also the first year I haven’t played with a vibration dampener in my racquet. I played with one of those since I was eight. This is the first year I’ve taken that off.”

Last month, the world No. 20 advanced to his first major semifinal at Wimbledon in his 42nd Grand Slam appearance—the longest wait to reach a Grand Slam final four in the Open Era.

Querrey clubbed 27 aces bursting through 12 of the final 14 games dethroning defending Wimbledon champion Andy Murray, 3-6, 6-4, 6-7 (4), 6-1, 6-1, in charging into the Wimbledon semifinals.

A year ago, a bold Querrey slammed 31 aces scoring a seismic 7-6 (6), 6-1, 3-6, 7-6 (5) third-round upset of reigning Wimbledon champion Novak Djokovic on Court No. 1.

The American No. 3 behind Jack Sock and John Isner has won two titles this season—in Acapulco and Los Cabos—including defeating former No. 1 Rafael Nadal in the Acapulco final.

The 29-year-old Querrey has won 12 of his last 14 matches as he faces Adrian Mannarino in Cincinnati tonight seeking his first win in three meetings with the 36th-ranked Frenchman.

“I’m playing well,” Querrey said. “I’m doing things right. I’ve got a lot of confidence. Hopefully, this will continue through the end of the year and over into next year.”

Photo credit: Western & Southern Open Facebook