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Federer's first Grand Slam meeting against Djokovic was at the 2007 Australian Open, which the Swiss won 6–2, 7–5, 6–3. Reuters
But Djokovic was more of a threat than Federer may have imagined. The Serbian's hard-fought 7–5, 6–3, 7–6 (7–5) win at the Australian Open in 2008 was also his first against Federer in a Grand Slam. Getty Images
In what usually culminates into a fight between stamina and fitness, Djokovic won the 2010 US Open semifinal against Federer 5–7, 6–1, 5–7, 6–2, 7–5 in three hours and 44 minutes. Getty Images
In another of those nerve-wracking games, this time it was the Swiss Master who emerged victorious at the French Open semifinal in 2011, winning 7–6(7–5), 6–3, 3–6, 7–6(7–5). Reuters
But in what will remain one of their most historic encounters, Djokovic and Federer fought through three hours and 51 minutes in the 2011 US Open. Djokovic won 6–7(7–9), 4–6, 6–3, 6–2, 7–5. Getty Images