Novak Djokovic is engaged to long-time girlfriend Jelena Ristic, according to his Twitter account.

On Wednesday, the No.1-ranked tennis player and six-time grand slam champion tweeted a photo of Ristic kissing him on the cheek and wrote: “Meet my fiance and future wife”.

After a smiley face, he continued: “So happy! Thank you for wonderful wishes”.

This is the 26-year-old Serb’s 100th week at No.1 in the ATP rankings.

He won the Australian Open in January, then was the runner-up at Wimbledon and the US Open.