Jannik Sinner, Aryna Sabalenka, Novak Djokovic and more of the 20 highest-ranked players included their handwritten signatures.

Plus, Stefanos Tsitsipas looks to continue his mysterious mastery of Monte Carlo, and more storylines we're following at the historic clay-court event.

The defending champion resides in Monaco and often boasts about the scenes on social media, while the 99-singles title holder has had notable celebrity run-ins in years past.