Serena Williams is preparing for the US Open 2013 and her coach and rumored boyfriend Patrick Mouratoglou showed his love for her on Twitter and Facebook as she awaits one of the biggest tennis tournaments.

"Thanks to all of you for your support. Serena is doing a great job. I am so proud of her. 10 finals this year and 8 titles. She will be ready for the US Open," Patrick Mouratoglou wrote on both his Facebook and Twitter accounts.

Patrick Mouratoglou also showed his support for Serena Williams' sister, Venus, on Twitter last week as she advanced at the Western & Southern Open in Ohio, leaving fans wondering if he's trying to tighten his relationship with his rumored girlfriend's family.

"#Venus playing much better now. More consistent and aggressive. In control of the rallies," the French tennis coach posted on Monday.

The tennis couple also made headlines for their relationship with Serena Williams' father, Richard Williams.

Richard Williams boycotted attending the Wimbledon 2013 tournament, where Serena Williams had an early dismissal, because he isn't happy she's dating Patrick Mouratoglou - the most likely cause of his discontent lies in the French coach's marital status, AOL Entertainment reports.

Patrick Mouratoglou is in a divorce case with ex-wife Clarisse Mouratoglou and is still dating Serena Williams.