Earlier this week, the most successful doubles team in tennis history ended their careers. Bob and Mike Bryan said goodbye to the sport less than a week before the start of the US Open, finishing off their time on the ATP Tour with 1,108 wins.

The twins shared a heartfelt message on Instagram to their fans.

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Their statistics boggle the mind: 39 ATP Masters titles, 30 Grand Slam finals, 438 weeks at the world No. 1 ranking, 178 tour-level finals, and that's just the beginning. They may not be signing off on their own terms, but their historic achievements will never be forgotten.

Test your knowledge of their illustrious career:

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QUIZ: A history 
lesson on the 
Bryan brothers

QUIZ: A history lesson on the Bryan brothers