At the 2009 Wimbledon Championships, his poor grass-court form from the past continued, as he went down to unseeded Lleyton Hewitt in the second round. In the Davis Cup quarter-final against the Czech Republic, del Potro won his matches against Ivo Minář and Berdych in straight sets, but Argentina still lost the tie 2–3, eliminating them from the competition. A few weeks later, he defeated Hewitt and Fernando González en route to the Washington final. He successfully defended his title against top-seeded Wimbledon finalist Andy Roddick to win his second tournament of the year and become the first player since Andre Agassi to win back-to-back Washington titles. Del Potro played the following week at the Masters 1000 in Montreal, where he was seeded sixth, defeating world No. 2 Nadal in the quarterfinals, his second win in a row over Nadal. He then defeated Roddick in the semifinals, saving a match point, to advance to his first Masters 1000 final, and to improve his head-to-head record against Roddick to 3–0. In the final, he lost against Murray in three sets. He later withdrew from the next Masters 1000 event in Cincinnati due to fatigue.