Olympic 1,500 meters bronze medalist Nick Willis of New Zealand has withdrawn from the IAAF world championships, he said on Tuesday. Willis will be focusing on recovering from hip surgery and prepare for the 2010 Commonwealth Games. 'I am back running for 50 to 60 minutes four or five times a week so I'm getting fairly fit, but I can't put in the intensive quality work on the track to get race sharp,' Willis said in a statement released by Athletics New Zealand on Tuesday. Commonwealth 1,500 meter defending champion Willis originally planned to run the 800 meters in next month's Berlin championships. 