Juan Martin del Potro won his 18th consecutive match and a spot in the Legg Mason Tennis Classic final with a 6-2, 6-1 victory over Tommy Haas on Saturday. Del Potro will face either Igor Kunitsyn or Viktor Troicki. Neither player has reached an ATP final. On Friday, Troicki eliminated top seed Andy Roddick, while del Potro's winning streak continued at the Classic. American Roddick was upset by unseeded Serb Troicki 0-6, 6-2, 6-4, in the quarterfinals, as Argentine second seed del Potro won his 17th straight match, a 6-4, 6-4 victory over American John Isner. Haas was a 7-5, 6-1 winner over Colombian Alejandro Falla. Kunitsyn beat Indian qualifier Somdev Devvarman 6-4, 6-1. Mauresmo advances In Ohio, unseeded Nathalie Dechy continued her best run of the year, moving into the semifinals of the Cincinnati Women's Open by beating sixth-seeded Aleksandra Wozniak 7-6 (4), 7-5 on Friday. Maria Kirilenko shook off a sluggish second set to beat Sabine Lisicki of Germany 6-2, 1-6, 6-1, while Nadia Petrova sailed past wild card Lilia Osterloh of the US 6-2, 6-3. Amelie Mauresmo defeated Vania King of the US 6-2, 6-4 to make the other semi an all
