KITZBUEHEL, Austria — Jurgen Melzer defeated Leonardo Mayer of Argentina 6-4, 6-2 after a five-hour rain delay today to reach the quarterfinals of the Austrian Open.

The sixth-seeded Austrian won 94 percent of the points on his first serve and converted three of four break points.

Melzer will play either second-seeded Rainer Schuettler of Germany or Jan Hernych of the Czech Republic. Their match was suspended because of rain with Hernych leading 6-2, 4-6, 3-2.

Two remaining second-round matches were also suspended and rescheduled for Friday. Seventh-seeded Juan Martin Del Potro led Sergio Roitman 6-2, 2-2, and Nicolas Devilder led Alexander Peya 6-4, 4-2.

On Monday, rain canceled play on the opening day.