Stan Wawrinka failed to convert 12 break points as he lost to Sam Querrey in the second round of the Fever-Tree Championships at Queen’s.

The Swiss, who has dropped to 261st in the world after injury, was beaten 7-5 6-7 (3-7) 6-1 by the American.

Wawrinka, a three-time Grand Slam champion, wasted seven set points at 5-4 in the first set and only capitalised on one of 13 break points in the match.

Querrey dominated on serve, hitting 25 aces as he closed out victory.

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Fifth seed and 2010 champion Querrey will face Croatian top seed Marin Cilic, who came from behind to beat Luxembourg’s Gilles Muller 4-6 6-3 6-3.

It was a battle of the big servers as the pair delivered 36 aces between them, with Cilic edging Muller 19-17.

American Frances Tiafoe reached his first ATP grass-court quarter-final with a 6-4 2-6 6-4 win over Leonardo Mayer of Argentina.

In the ATP grass-court tournament in Halle, French Open runner-up and third seed Dominic Thiem was stunned 6-2 7-5 by world number 52 Yuichi Sugita of Japan.

Seventh seed Kei Nishikori was also knocked out, with Russia’s Karen Khachanov beating the Japanese player 6-2 6-2 to go through to the quarter-finals.

Khachanov, who reached the fourth round at this year’s French Open, will next face Roberto Bautista Agut after the Spanish fourth seed beat Dutchman Robin Haase 4-6 7-5 6-4.

The top seed in Halle is Swiss eight-time Wimbledon champion Roger Federer, who plays Frenchman Benoit Paire on Thursday for a place in the last eight.