I think it has to be 08-12 as a whole, in their totality they were wild.
There were lots of twists and turns:
08 - Fed’s insane dominance ends as first Djokovic and then Nadal take what had been “his” slams up until then, and Nadal grabs World No 1. The way Nadal beat Fed like a drum at RG had people questioning whether Fed would ever win RG in his career
09 - As Nadal reduces Fed to tears by taking the one surface left to him in their slam rivalry, he seemed set to dominate, and Fed looked in real trouble in the spring… then boom, Ned gets injured and before we know it, Fed has 14… at RG! And he’s knocking on the door of 15. Even that had a twist though with that crazy Roddick match. Just as we think Fed is going to do 6 USOs, up pops JMDP, another future ATG, or so it seems…
10 - now it’s Fed who looks set to dominate again as he takes the AO for his 4th slam in the last 5, while Nadal retires vs Murray injured, and JMDP starts to feel the injuries. People are writing a moratorium on Nadal with his injuries stacking up but lo and behold, he rebounds like a MF sweeping clay and RG, and now it’s Fed struggling with injury and not even making it to slam finals anymore. Nadal sweeps 3 slams in 3 surfaces in 3 months, and his own era is set to begin, except…
11 - peak Djokovic just appears. Straightaway. He’s ruining everyone, even Nadal on clay, and is set to win RG… but there’s Fed with the best match of his life on clay outta nowhere??? Damn. But Djoker rebounds to become a multi-surface slam winner. Fed doesn’t even make the SFs of Wimbledon this time as the strong era bites back… is he done on grass? Djoker finishes 10-1 vs Fedal. Has he figured Nadal out? And hang on, is Fed back in prime form as he dominates tournament after tournament to end the year?
12 - all hell breaks loose. This is the peak of tennis.
Nadal beats Fed, who hasn’t lost in ages, at the AO; people think Fed won’t win a slam ever again. Then Ned launches his counterattack on Djoker. First he almost beats him at the AO. But Djoker is a machine, RLA is his court. Then Ned roars back on clay to dominate the entire swing beating Djoker 3x. Wimbledon looks like it’s between the Big 3, probably Djokodal, but there’s ANOTHER twist - Nadal is not only out, he’s out for the year. Djoker suffers his 2nd defeat to Fed in their last 4 slam meetings and suddenly, Fed’s won his 1st slam in 2.5 years and is looking at World Number 1?! Where did that come from? He has a chance to win the Olympics on the same court but THIS IS REAL, MURRAY HAS JUST THRASHED FEDERER 3-0 ON CENTRE COURT. It’s Andy’s world. Fed and Djoker are in a battle for world Number 1 going into the US Open where they’ve played 5 years in a row, but the strong era is here and Fed is out before the SFs AGAIN and suddenly, Murray is beating Djokovic in a slam final. It’s a proper Big 4 now. Year ends with a classic Fedovic tussle down to the last point.