Melbourne:Nikolay Davydenko destroyed Tim Henman's Australian Open campaign on Saturday as the Russians continued their assault on the first Grand Slam of the year. Henman surrendered 4-6, 2-6, 2-6 in a little over two hours allowing the Russian to enter the fourth round in Melbourne. The seventh-seed failed to mount any real challenge, continuing a history of disappointments at the major tournaments. Assured place Argentina are already assured of at least one player in the quarter-finals after Guillermo Coria and David Nalbandian were drawn to play each other in the fourth round. Sixth seed Coria beat Spainiard Juan Carlos Ferrero 6-3, 6-2, 6-1. In the women's draw, world number one Lindsay Davenport defeated Czech teenager Nicole Vaidisova 6-2, 6-4. She will play with 13th seed Karolina Sprem in the fourth round. Sister act Venus Williams joined her sister in the fourth round after she beat Israel's Anna Smashnova 6-3, 6-0 Elena Dementieva wore down Slovakia's Daniela Hantuchova 7-5, 5-7, 6-4 surviving a match that lasted for 3 hours and featured 13 service breaks. Dementieva, runner-up at last year's French and US Open became the seventh Russian woman to reach the last 16.