One of the ATP World Tour's indefatigable veterans, Nikolay Davydenko, retired this week. The 33-year-old Russian is the only pro to face Rafael Nadal five times or more and own a winning record against him (6-5).

Injuries began to pile up for Davydenko starting in 2010, and among the 21 tournament titles clinched in his career, he last claimed one in 2011. But his speed and spunk—hounding the likes of Rafa and Roger Federer for a couple seasons especially—will be remembered for years to come. The man known as "Kolya" and "Ironman" certainly made his mark on the game. (For more, here are Steve Tignor and Peter Bodo's thoughts on Davydenko, "the most human of tennis machines."

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The Spin would be remiss to not mention a couple other timely and amusing tweets this week, from Maria Sharapova and Eugenie Bouchard at the WTA Finals and via Tomas Berdych, who learned that Ivan Lendl will not join his team as coach.

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Meanwhile, Serena Williams arrived at her Singapore hotel for the WTA Finals showdown to find flowers intended for Ana Ivanovic in her space. She promptly Instagrammed the mix-up, tweeted it, and sent the flowers over to Ivanovic ... replete with added champagne. Stay classy, Serena.

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Thoughts on Davydenko's departure from the pro game?

Got a tip or a point to make? Hit me on Twitter at @jonscott9.