Top-seeded David Nalbandian was knocked out in the first round by Austrian qualifier Daniel Koellerer 1-6, 6-3, 6-4 at the Mexican Open on Tuesday. Nalbandian, last year's runner-up who won his 10th career title last month, appeared to be headed for a romp after winning the first set, but the Argentine's serve worsened and Koellerer was able to take advantage to win only his sixth ever match on... More...