Nicolas Kiefer has announced his retirement from tennis with immediate effect.
First round: 9-David Ferrer (Spain) beat Nicolas Kiefer (Germany) 6-4 6-2 6-3;
World number four Andy Murray will get his Wimbledon campaign underway against Jan Hajek second on Court 1.
Australia's Lleyton Hewitt stormed into the quarter-finals of ATP Halle with a comfortable 6-3 6-3 win over Dutchman Thiemo de Bakker.
Second round: 8-Lleyton Hewitt (Australia) beat Thiemo de Bakker (Netherlands) 6-3 6-3
Roger Federer got his grass-court tournament off to a winning start with a 6-4 6-4 victory over Jarkko Nieminen at Halle.
Teenager Laura Robson was among five Britons given wildcards for Wimbledon - but there was no room for men's number two Alex Bogdanovic.
First round: Mischa Zverev (Germany) beat Florent Serra (France) 6-4 6-4
Germany's Nicolas Kiefer and Kei Nishikori of Japan are handed Wimbledon wildcards.
First round: Simon Greul (Germany) beat Nicolas Kiefer (Germany) 7-5 6-2;
ATP World Tour Finals
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