Eastbourne, England - Former number one Jelena Jankovic confessed Tuesday that she would take a break from tennis immediately were it not for Monday's start of Wimbledon.

The third-seeded Serb complained of weakness in her legs and an uncomfortable feeling on the grass during her first match of the season on the surface, a 6-7 (5-7), 6-3, 6-2 loss to Anna Chakvetadze at the Eastbourne Championships.

"I'm missing motivation at this moment," said Jankovic, who finished 2008 atop the WTA rankings and now stands sixth. "I'll play Wimbledon and then we'll see. At least I can take a few weeks off then."

The volatile Jankovic has always played on emotion, her feelings hard to hide.

The current problem seems to be the quick adjustment to grass where a different set of movement and skills are required for the brief three-week span.

"I wish I could take a break now," said Jankovic, winner of a clay title in Spain two months ago but a fourth-round loser at the French Open. "I need to get to where I want to play tennis again."

Jankovic has been dissatisfied with her form ever since gaining seven kilograms of muscle during the winter season. She is now trying to lose it after it restricted her movement and feel on the court.

Switching over to grass has not been the easiest task.

"It was my first grass match (this season) and it was tough to get the rhythm out there. I started so slow," she said after trailing 5-1 but winning the first set against the Russian. "I didn't feel comfortable.

"But going for the low balls, my legs got tired, in the third set, I didn't have the injury to get down low.

"If you don't do that, the balls got right by you. I thought I had the match under control and was dominating. but it's so easy to get out of rhythm.

"I need to get back the desire to fight and work hard in the matches."

By contrast, Danish sixth seed Caroline Wozniacki was all smiles with her defeat of Russian Alisa Kleybanova 6-3, 6-2. Holder Agnieszwa Radwanska, the eighth seed, beat her younger sister Ursula 6-1, 6-1 in a solid start to a title defence.

On the men's side, the top seed lasted only briefly as Canadian Frank Dancevic upset Russian Igor Andreev 7-6 (8-6), 6-2.

Number 126 Dancevic, who beat David Nalbandian last year at Wimbledon, won only his second match since August as his game suddenly lifts.

Croatian veteran Ivan Ljubicic was the first into the ATP quarter-finals thanks to his 6-3, 7-5 defeat of Briton Joshua Goodall. (dpa)