Sam Querrey says there's a simple reason for the rash of Wimbledon upsets: the slick surface is more unpredictable and players play few matches on lawn contributing to an unsettling feeling.

The 2017 Wimbledon semifinalist joined the ever-expanding list of upset victims.

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Gael Monfils crashed to the court on the first point of the second set and left the court for treatment. When he returned, Monfils carved up Querrey with passing shots scoring a 5-7, 6-4, 6-4, 6-2 triumph over the 11th-seeded American.

Contesting his 10th Wimbledon, Monfils advanced to the fourth round for the first time where he will face 2017 US Open finalist Kevin Anderson for a quarterfinal spot. 

Querrey is the 10th of the Top 20 men's seeds to bow out in week one joining third-seeded Marin Cilic, Grigor Dimitrov, Dominic Thiem, David Goffin, Diego Schartzman, Borna Coric, Lucas Pouille, Jack Sock and 20th-seeded Pablo Carreno Busta on the departure list. 

"A clay court and a hard court, it doesn't feel that different to me," Querrey told the media. "A grass court, you know, it's very different. I feel like more intangibles come into play, much more difficult to move on it. 

"You know, a lot of guys or women play two events on it. If you don't play a lot on it, it's hard to move on it, and it's just—the game is just a little more uncomfortable out there. I think that's why you see more upsets."

Next year Grand Slam tournaments will downsize from 32 seeds to 16 seeds. 

Querrey isn't an advocate of that move because it could cost him a seed.

"A lot of times I float around between 17 and 32," Querrey said. "That's the honest truth. That's why I don't want that changing.

"I am a fan of trying new things in tennis. So, you know, if they want to try that for three years and see if we get great matchups and it works and the fans like it, that's fine with me. I'm just, me personally, I don't want it."

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