the 2007 Stockholm Open, where he lost to Tommy Haas, and the third round of the 2007 Madrid Masters, after avenging his lost against Tommy Haas in the second round. In the Grand Slams, Monaco lost in the first round of the Australian Open and Wimbledon, losing to Nicolas Mahut and Kristof Vliegen, respectively. However, he reached the fourth round of the French Open and the US Open, losing to former French Open Champion Guillermo Cañas and Novak Djokovic. These results are the farthest he has gone at Grand Slams. He ended the year ranked no. 23, his highest year-end rank. 2008 In 2008, Monaco started the year with a semifinal appearance at the 2008 Heineken Open, losing to German Philipp Kohlschreiber. He also reached the third round of the 2008 Australian Open, the furthest he has reached so far, losing to Tomáš Berdych. In his first tournament after the Australian Open, he reached the final of the 2008 Movistar Open. He was scheduled to play Fernando González in the final, but Gonzalez was granted a walkover due to a left ankle injury sustained by Monaco during the doubles final. Despite this, his performance during the week elevated Monaco to a career-high ranking of world no. 14. At the 2008 Copa Telmex as the defending champion, Monaco lost in the first round. Shortly afterwards, he lost in the second round of the 2008 Abierto Mexicano Telcel in Acapulco. He also reached the third round of both the 2008 Pacific Life Open in Indian Wells, losing to Guillermo Cañas, and the 2008 Sony Ericsson Open in Miami, losing to Mario Ančić. He represented Argentina in the Davis Cup quarterfinal clash against Sweden and won his only match against Thomas Johansson. He reached the quarterfinals in Valencia and the second round of the 2008 Monte Carlo Masters and 2008 Rome Masters losing to Nicolás Almagro and Igor Andreev, respectively. He also reached the third round of the 2008 Hamburg Masters, losing to Andreas Seppi and the final, of 2008 Hypo Group Tennis International losing to top seed Nikolay Davydenko. He reached the semifinals of the 2008 Orange Warsaw Open, losing to Tommy Robredo. At the Beijing Olympics, Monaco lost to Marin Čilić in three tight sets 4–6, 7–6(7-5), 3–6, followed by successive defeats at the 2008 Pilot Pen Tennis and the 2008 US Open. He fell in the first round of the