It was a rough day for Canada at the All England Club.

Milos Raonic retired because of injury Wednesday and Rebecca Marino and Stephanie Dubois also bowed out in the second round as the last Canadian singles players were eliminated at Wimbledon.

Raonic had just broken Luxembourg's Gilles Muller for a 2-1 lead in the first set when he went down awkwardly and was forced to call it quits after just 23 minutes.

The 20-year-old from Thornhill, Ont., was moving to his left at the baseline at 15-all but lost his footing and tumbled. His legs went in different directions as he tried to move back to his right.

"I don't know anything," Raonic said of the injury. "It's too soon for a diagnosis on what it is. But it's something pretty deep in the hip.

"It's around both the inside and outside of the hip. A minor pull on the inside, but on the outside, it's [related to] the joint."

Later Wednesday, Marino dropped a 7-6 (3), 6-2 decision to No. 29 seed Roberta Vinci of Italy and Dubois fell 6-3, 4-6, 6-3 to Germany's Andrea Petkovic.

Rain had delayed the start of the day's play, though courts were covered during several hours of bad weather.

Raonic, who went to hospital for an MRI, grimaced and spent some time sitting where he fell as officials and his opponent looked on.

A trainer worked on his leg and Raonic eventually limped to the sidelines where he received more treatment and had his right thigh wrapped.

"I knew right away. I didn't think I could even lift my leg. It was a pretty sharp pain," Raonic said. "But as time passed, with the treatment, I was able to walk a bit."

He returned to action, moving gingerly and won his service game before Muller won his.

Raonic, the 31st seed, saw the trainer again during the break and retired while leading the set 3-2.

Raonic and Muller both ended with five aces, with the Canadian hitting 14 winners.

His unexpected exit was a huge disappointment for the big server who had stormed into the second round 48 hours earlier.

A win by Raonic would have seen him face defending champion Rafael Nadal in the third round.

"I haven't had too many injuries, so I can't really tell [how serious it is], I don't know my body that well," Raonic added. "I'm really in the dark.

"It could be just a minor bruising that could get better in a few days. Or it could be something more serious."

Marino won her first Wimbledon match Tuesday and held a 4-2 lead before the experienced Vinci pulled level at 5-all. Vinci saved a Marino set point in the 12th game to set up a tiebreaker.

The Italian won the set when Marino sent her return wide.

Dubois overmatched

Vinci took a 4-1 lead in the second and saved a pair of break points for a 5-2 lead before finishing off Marino, who finished with seven aces but 33 unforced errors.

Dubois, of Laval, Que., looked overmatched in the first set against the Petkovic, but battled back against the No. 11 seed before falling in three sets.

"[Petkovic] played very good in the first few games of the third set and that's why their ranking is high because they play well when it's important," Dubois said on a conference call. "It was 5-0 [in the third set], but it didn't feel like 5-0 and for me it's good, I never gave up."

It was Dubois' best showing in four appearances at Wimbledon's main draw. She cracked the second round for the first time in her career.

"I am very happy about the way that I played and the attitude I had on the court," she said. "I played my game and was aggressive. Next time I know I am going to do it and I have a lot of confidence."

Raonic, Marino and Dubois were the first three Canadians to make Wimbledon's second round in the same year since Sonya Jeyaseelan, Sebastien Lareau and Daniel Nestor did it in 2000.