The two were pictured kissing in the Spanish capital on Wednesday, the day after Dimitrov sealed the biggest win of his career against world number one Novak Djokovic.

The Bulgarian said after that match that he had been inspired by a "few words" from his girlfriend that he would "remember definitely for the rest of my life".

And after defeating Kaia Kanepi, Sharapova continued her innovative use of signing the courtside camera post-match to write "how did you catch us?"

Asked what she meant by the message, the 26-year-old laughed and said "I don't know. You tell me."

Last year Sharapova called off her engagement to another athlete, basketball player Sasha Vujacic.