Rafael Nadal
2008: Two majors, Olympic singles gold, and world No. 1

Nadal began the year in India, where he was comprehensively beaten by Mikhail Youzhny in the final of the Chennai Open. Nadal then reached the semi-finals of the Australian Open for the first time; Jo-Wilfried Tsonga defeated him in the semi-finals in straight sets. Nadal also reached the final of the Miami Masters for the second time, which he lost to Nikolay Davydenko.

During the spring clay-court season, Nadal won four singles titles and defeated Roger Federer in three finals. At the Monte Carlo Masters, he beat Federer in the final for the third year in a row to become the first player to win four consecutive titles there since Anthony Wilding in 1914. Furthermore, he also won the tournament's doubles event paired with Tommy Robredo, thus becoming the first player since Jim Courier in 1991 to win the singles and doubles titles at a Masters Series event. Nadal then won his fourth consecutive title at the Open Sabadell Atlántico tournament in Barcelona. A few weeks later, Nadal won his first Masters Hamburg title defeating Federer in a three-set final, thus becoming only the third player to have won all three clay-court Masters Series titles, in Rome, Monte Carlo and Hamburg. He then won the French Open, becoming the fifth man in the Open Era to win a Grand Slam singles title without losing a set. He defeated Federer in the final for the third straight year, but this was the most lopsided of all their matches, as Nadal only lost four games and gave Federer his first bagel since 1999. This was Nadal's fourth consecutive French title, tying Björn Borg 's all-time record. Nadal became the fourth male player during Open era to win the same Grand Slam singles tournament for four consecutive years (the others being Borg, Pete Sampras, and Federer).

Nadal then played Federer in the final of Wimbledon for the third consecutive year, in the most anticipated match of their rivalry. Nadal entered the final on a 23-match winning streak, including his first career grass-court title at the Stella Artois Championships staged at the Queen's Club in London prior to Wimbledon, while Federer had won his record fifth grass-court title at the Gerry Weber Open in Halle, and then reached the Wimbledon final without losing a set. Unlike their previous two Wimbledon finals, though, Federer was not the prohibitive favorite, and many analysts picked Nadal to win. At 4 hours and 48 minutes, they played the longest (in terms of time on court, not in terms of numbers of games) final in Wimbledon history, and because of rain delays, Nadal won the fifth set 9–7 in near-darkness (The 2019 final later broke the record for the longest Wimbledon final). The match was widely lauded as the greatest Wimbledon final ever, with some tennis critics even calling it the greatest match in tennis history.

By winning his first Wimbledon title, Nadal became the third man in the open era to win both the French Open and Wimbledon in the same year, after Rod Laver in 1969, and Borg in 1978–1980, as well as the second Spaniard to win Wimbledon after Manolo Santana in 1966. He also ended Federer's record streak of five consecutive Wimbledon titles and 65 straight wins on grass courts. This was also the first time that Nadal won two Grand Slam tournaments back-to-back.

After Wimbledon, Nadal extended his winning streak to a career-best 32 matches by winning his second Canada Masters title in Toronto, thus becoming the third youngest player to accumulate 30 titles behind Borg and Jimmy Connors, and then reaching the semi-finals of the Cincinnati Open, in which his winning streak was snapped by Djokovic. Nadal then played at the 2008 Beijing Olympics, where he defeated Serbia's Novak Djokovic in the semi-finals and Chile's Fernando González in the final to win the gold medal. With the win, Nadal finally clinched the world No. 1 ranking on 18 August, ending Federer's record four-and-a-half-year reign at the top.

At the US Open, Nadal was the top-seeded player for the first time at a major. He did not lose a set during his first three matches, but lost in the semi-finals to Andy Murray. Later in the year in Madrid, Nadal helped Spain defeat the United States in the Davis Cup semi-finals. At the Madrid Masters, Nadal lost in the semi-finals to Gilles Simon. However, his performance at the event guaranteed him the year-end No. 1 ranking, making him the first Spaniard to finish a season as such in the Open Era. Two weeks later at the Paris Masters, Nadal reached the quarterfinals, where he withdrew because of a knee injury. The following week, Nadal announced his withdrawal from the year-ending Tennis Masters Cup in Shanghai, citing tendinitis of the knee. On 10 November, Nadal withdrew from Spain's Davis Cup final against Argentina, as his knee injury had not healed completely.
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