Women singlesSharapova  bt  Kirilenko     6-2, 6-3Men’s singlesFederer  bt  Del Potro     3-6, 7-6, 19-17LONDON - Russian flag bearer Maria Sharapova reached the Olympic women’s singles final with 6-2 6-3 victory over compatriot Maria Kirilenko at Wimbledon.The third seed, competing at the Games for the first time, will now hope to emulate Elena Dementieva who won gold in the event for Russia in Beijing four years ago.Sharapova, wearing a dashing red shirt, was made to fight by Kirilenko in the second set but claimed victory with a volleyed winner on her second match point before blowing kisses to the fans watching on Court One.She will face either Wimbledon champion Serena Williams or Victoria Azarenka for gold.Meanwhile, Roger Federer clinched the first singles medals of his career Friday when he won an Olympic marathon.Federer outlasted Juan Martin del Potro of Argentina in the semifinals, 3-6, 7-6 (5), 19-17 in 4 hours, 26 minutes. Federer converted only two of 13 break-point chances, the second coming in the next-to-last game.A four-time Olympian, Federer clinched at least a silver. On Sunday he’ll play in the final against the winner of the second semifinal between No. 2-seeded Novak Djokovic of Serbia and No. 3 Andy Murray of Britain.