Hamburg, Germany –  A pair of top-four seeds -- Juan Monaco and Marin Cilic -- were among Tuesday's first-round winners at the $1.1 million German Tennis Championships.

The third-seeded Monaco got past German Cedrik-Marcel Stebe 6-4, 3-6, 7-5, while a fourth-seeded Cilic handled Italian Flavio Cipolla 6-3, 6-4 on the red clay at Rothenbaum Tennis Arena.

The Argentine Monaco was a runner-up in Stuttgart here in Germany last week, while Cilic is fresh off his title in Umag in his native Croatia.

In other action involving seeds on Day 2, German wild card Julian Reister upended No. 5 Fernando Verdasco of Spain 6-2, 6-3; No. 6 Philipp Kohlschreiber overcame fellow German Bjorn Phau 4-6, 6-2, 6-3; No. 7 German Florian Mayer got past Argentine qualifier Horacio Zeballos 7-6 (9-7), 7-5; and Czech Lukas Rosol doused No. 8 Viktor Troicki of Serbia 5-7, 6-3, 6-4. Rosol shocked the great Rafael Nadal in a second-round match on Centre Court at Wimbledon last month.

Meanwhile, long-time German favorite Tommy Haas, a wild card this week, drilled Slovak Martin Klizan 6-2, 6-1. Up next for Haas will be reigning Hamburg champ Gilles Simon, who beat this week's top seed, Nicolas Almagro, in last year's Hamburg finale. Almagro, who is currently on the court in Hamburg, was the runner-up in Sweden last week.

Also on Tuesday, Albert Ramos topped fellow Spaniard Pablo Andujar 6-1, 6-4, France's Jeremy Chardy handled Spaniard Albert Montanes 6-4, 6-2, and Italian Fabio Fognini bested Turkish qualifier Marsel Ilhan 7-5, 6-2.

The 2012 Hamburg champion will collect $265,000.