In July 2008, Dementieva reached her first semi-final at the Wimbledon Championships but lost in straight sets to the eventual champion, Venus Williams. She rebounded by winning the Gold Medal in singles at the 2008 Beijing Olympics, defeating her compatriot, Dinara Safina in the final. Later that year, she reached her second consecutive grand slam semi-final at the US Open but lost in straight sets to the eventual runner-up, Jelena Janković. Dementieva finished the year by reaching the semi-finals of the WTA Tour Championships for the second time in her career where she lost in three sets to the eighth seed, Vera Zvonareva. Dementieva finished the year ranked World No. 4, which remains her best finish to date. Dementieva began the 2009 season by winning the ASB Classic and Medibank International, defeating her compatriots Elena Vesnina and Dinara Safina in the finals before reaching her first and only semi-final at the Australian Open where she lost to the eventual champion in straight sets. As a result, Dementieva has now reached the semi-finals or better at all four grand slam events. On April 3, 2009, Dementieva achieved a new career high singles ranking of World No. 3. Later that year, she reached her second consecutive semi-final at the Wimbledon Championships and won the Rogers Cup by defeating compatriot Maria Sharapova in the final in straight sets. In her final year, Dementieva reached the semi-finals of the 2010 French Open where she retired against eventual champion, Francesca Schiavone after losing the first set in a tie-break. Dementieva finished the year and her career ranked World No. 9.