Djokovic in Rotterdam semis as injured Mayer withdraws

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By Theo Ruizenaar

ROTTERDAM (Reuters) - Serbian top seed Novak Djokovic qualified for the semi-finals of the World Indoor Tournament Thursday after his next opponent Florian Mayer withdrew injured.

Djokovic beat Marco Chiudinelli of Switzerland 6-4 6-2 in the second round and would have faced Mayer in the quarter-finals but the German pulled out with a hamstring injury after beating Tommy Robredo Wednesday.

"It is never the best way to get a win like this and I feel sorry for Florian," Djokovic told reporters.

World number two Djokovic dominated on serve against Chiudinelli but needed more than a dozen break chances to see off the Swiss in a match lasting 90 minutes.

"I played conveniently and dominantly from the start on my own service game, and had many opportunities on his, however, I was less successful. I used the ones I needed." he added.

Russian sixth seed Mikhail Youzhny beat Turkish qualifier Marsel Ilhan 6-4 6-4 to set up a quarter-final with Gael Monfils.

The Frenchman, seeded four, beat Dutch wildcard Thiemo de Bakker 6-3 6-2.

(Editing by Alison Wildey)