MUNICH, Germany, April 29 (UPI) --
Defending champion Philipp Kohlschreiber and fifth-seeded Tommy Haas both withdrew Tuesday from the BMW Open tennis tournament in Germany.
Kohlschreiber, seeded third, pulled out because of a respiratory infection. He was replaced by Julio Silva, who then defeated Matthias Bachinger 3-6, 6-2, 6-3 and advanced to the tournament round of 16.
Haas cited a nagging shoulder injury as his reason for withdrawing. His place in the draw hadn't yet been filled.
On the court, second-seeded Fernando Gonzalez knocked out Dudi Sela 6-3, 6-4 and No. 4-seeded Igor Andreev advanced with a 6-3, 6-4 win over Gael Monfils.
In other first-round matches Tuesday, Gianluca Naso, Philipp Petzschner and Korean Lee Hyung-taik all advanced.
Two first-round matches that were rained out Tuesday will open play Wednesday, which will also see the second round begin.
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