Serena Williams posted on Twitter on Wednesday that she is obsessed with jewelry chain Zales, leaving many fans wondering if she was giving her coach and rumored boyfriend Patrick Mouratoglou hints at a possible engagement.

Earlier this week, Maria Sharapova revealed during a recent interview that she only has respect for Serena Williams on the court, USA Today reports.

"On the court, I have the utmost respect for her; I really do," Maria Sharapova said about Serena Williams during a New York Times interview.

When asked if she also has respect for her off the court, she replied "it's different."

"I don't know what it is, but it's different, and to me, even though that tennis is such a huge part of our lives, at the end it's such a small part of our lives, and I value so many other more important things in life than just the sport."

Serena Williams asked fans via Twitter on Saturday for the title of a "good duet to sing," leaving many wondering if she's planning on making her relationship with Patrick Mouratoglou public.

One fan mentioned the famous Paul McCartney and Stevie Wonder song "Ebony and Ivory."