Luxembourg, Luxembourg (My Sportsbook) - U.S. Open champion Kim Clijsters was an easy first-round winner, while U.S. Open runner-up Caroline Wozniacki succumbed to a leg injury Tuesday at the $220,000 Luxembourg Open.

Playing her first match since capturing her second U.S. Open title last month, a second-seeded former world No. 1 Clijsters clobbered American Meghann Shaughnessy 6-2, 6-2 at CK Sportcenter Kockelscheuer.

The five-time Luxembourg titlist Clijsters will face Swiss veteran Patty Schnyder in the second round here.

A top-seeded Wozniacki, meanwhile, was whipping Luxembourg's own Anne Kremer 7-5, 5-0 when the rising Dane suffered a left hamstring injury.

Wozniacki was supposed to meet American Melanie Oudin in the first round here, but Oudin, who lost to Wozniacki in the U.S. Open quarterfinals last month, pulled out of the draw because of an illness, opening up a spot for the 34- year-old Kremer.

The world No. 6 Wozniacki was last year's Luxembourg runner-up to Russian star Elena Dementieva.

Another seed bowed out here on Tuesday, as Italian Roberta Vinci doused No. 7 Ukrainian Kateryna Bondarenko 6-0, 6-2.

Israeli Shahar Peer pasted Czech qualifier Barbora Zahlavova Strycova 6-1, 6-3, while the aforementioned Schnyder dismissed Czech Petra Kvitova 6-4, 6-1. Kvitova was a finalist in Austria last week.

Additional Day-2 wins came for Belgian qualifier Kirsten Flipkens, France's Alize Cornet, Slovenians Katarina Srebotnik and wild card Polona Hercog, and Swiss Timea Bacsinszky.

This week's titlist will claim $37,000.