Three-times former champion Andy Roddick had a bumpy ride into the quarterfinals at Queen's on Thursday, pushed all the way on his favoured grass surface by British wildcard Alex Bogdanovic.
The world number five looked the lesser player for much of the contest that he eventually won 4-6, 7-6, 6-4.
"I was lucky to get out of it today," he said.
Bogdanovic, ranked 117 in the world, rattled Roddick by finding the lines on both sides of the court and wrong-footing the American with a powerful backhand. Roddick was clearly exasperated at his own game, shaking his head, hands on hips between points after sending groundstrokes long or wide.
Bogdanovic broke the famous Roddick serve in the third game and clung on to his lead to take the first set with two big serves of his own.
The pair looked evenly matched throughout the second set with Bogdanovic, 23, saving a set point in the 10th game.
He took the 24-year-old American to the brink in the tiebreak, finally succumbing 7-5 to a Roddick forehand on the line and big serve that he could only return long.
Second-seeded Roddick expected to feel more in command on grass after his humiliating first-round exit at the French Open on clay earlier this month, but it was not until the seventh game of the third set that he broke the British number three's serve. His experience showed then and he held firm to win with an overhead smash on his first match point.
Roddick meets another wildcard, lofty Croat Marin Cilic in the quarter-finals. Cilic, 18, the top junior in the world last year, overcame French qualifier Jo-Wilfried Tsonga, second-round victor over defending champion Lleyton Hewitt, 4-6, 6-3, 6-2.
Third seed Fernando Gonzalez of Chile advanced stealthily, beating American Robby Ginepri 6-2, 7-5.
Though he commands none of the headlines of top seed Rafael Nadal and Roddick, the Australian Open runner up, ranked sixth in the world, has some grasscourt pedigree having reached the quarter-finals here last year and at Wimbledon in 2005.

Hewit crashes
On Wednesday, defending champion Hewitt was sent crashing out by  Tsonga in the second round. Hewitt was bidding for a record fifth singles crown at the traditional Wimbledon warm-up, but Tsonga, ranked 121st in the world, pulled off a stunning upset as he beat the Australian 7-6 (7-5), 7-6 (7-2).
Tsonga, 22, came into the tournament in excellent form, having won challenger titles in Surbiton and Lanzarote.
Hewitt, a former Wimbledon champion, would still have expected to emerge unscathed, but quickly found he wasn’t going to have it all his own way.
Tsonga matched his supposedly superior opponent throughout a tight first set and held his nerve impressively to win the tie-breaker.
There was no sign of Tsonga letting his guard down after that success. He kept Hewitt pinned back with some powerful groundstrokes and the Australian became increasingly frustrated.

Baghdatis through
Meanwhile, in Halle Open in Germany,  eighth seed Cypriot Marcos Baghdatis moved into the third round beating Sweden’s Robin Soderling 6-7 (9-7), 6-4, 6-3.  In another second round encounter, Jarkko Nieminen of Finland edged past Romanian Andrei Pavel  7-6(7-5), 3-6, 6-1.