Arriving at the Silver Arrows in 2013, the British driver forged a near-unbeatable force, claiming an astonishing six drivers' championships in that period.
A controversial season finale in Abu Dhabi 2021, however, saw his shot at a record eighth title dashed by a late race call from Michael Masi, paving the way for Max Verstappen's maiden title and dominant rise.
Since the regulation changes in 2022, Mercedes haven't quite found their footing, with Hamilton yet to win a race since the 2021 Saudi Arabian Grand Prix.
Despite his seven titles and record 103 victories, the Brit seems hungry for more. A stunning new chapter awaits in 2025 as he prepares to swap silver for red, partnering Charles Leclerc at Ferrari and replacing Carlos Sainz.
The rivalry between Nico Rosberg and Hamilton during their years together at Mercedes is well-documented. They pushed each other to new heights, with Rosberg narrowly edging out Hamilton for the 2016 championship by only five points, claiming his sole championship before going on to a surprise retirement from the sport right after.
Speaking to Sky Sports on Friday, the German admitted that he was surprised when the news broke.
"Of course, it came as a huge surprise," Rosberg said. "No-one expected it, and I didn’t expect it either.
"But if you look at the grand scheme of things, then why not? It’s towards the end of his career. Two legendary teams - Mercedes and Ferrari.
"I know Lewis is a fan of Ferrari road cars, also. So why not make that switch and have a different experience, driving in red. Then he ticks off both boxes, driving for the two most legendary teams."
Hamilton's move from McLaren to Mercedes in 2013 was met with a similar surprise. McLaren were still winning races then, while Mercedes were a team on the rise but far from contenders.
"By the way, at the moment, it seems in performance terms to be the right decision for him," Rosberg continued.
"Maybe he will make an amazing move like 12 years ago when he moved from McLaren to Mercedes. McLaren were winning races, Mercedes were nowhere.
"The moment he moved, McLaren went backwards and Mercedes started winning races. Maybe he can get the same timing again."