Pulling off the “Sunshine Double”—winning Indian Wells and Miami back-to-back—is one of the most impressive feats in tennis. Baseline is looking back at some of the rare accomplishments.

No Grand Slam titles in five years. A ranking lower than it’s been in more than a decade. Recent knee surgery that forced him to the sidelines. A year without a singles triumph for the first time since the dawn of the new millennium.

Add in the fact that he entered the 2017 season at the advanced age of 35, and the outlook could have hardly been grimmer on a return to form for Roger Federer.

Right from the start, though, the Swiss legend showed why he’s among the greatest players to ever touch a racquet. After beginning his campaign at the Hopman Cup, Federer entered the Australian Open as the 17th seed and would go on to win the tournament, defeating three of the top five players in the world in five-setters along the way for his 18th career Grand Slam title.

After suffering a surprise setback in Dubai, the world No. 10 turned his focus to Indian Wells, Calif., for the first Masters 1000 event of the year. In the desert, Federer was experiencing a drought similar to his prior Slam misfortunes, as it had been five years since his last victory at the tournament.

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Just like in Melbourne, though, he put an end to the skid in stunning fashion, winning the event for the fifth time and beating four top-20 players in the process.

Next up was the Miami Open, where he had been much less prolific: His most recent of two career titles there came in 2005. Continuing to show his strong play in the early part of 2017 was no fluke, Federer won his third title of the year, defeating Rafael Nadal in the final.

That victory over Nadal was Federer’s third of the season against his top rival, and the Miami Open win marked a significant milestone for the Swiss: In his lengthy career, it was the first time he completed the Sunshine Double.