#5 Caroline Wozniacki (DEN)
Current World Ranking: 2
Last year’s result: Quarter-finals
The eternal bridesmaid finally won her first title when she won a gem of a match against Halep in this year's Australian Open over three sets which lasted more than three hours.
This after an ankle injury suffered in the middle of the 2016 season saw her ranking drop to as low as 74th which led to fears that Wozniacki would never return to her previous heights.
But the 27-year-old has not reached a final since, with her best showing coming in Doha where she lost to the eventual champion, Petra Kvitova. Her most recent outing saw her go down to Anett Kontaveit in the quarter-finals of the Italian Open in Rome.
Her record at Roland Garros is also modest, having reached the quarter-finals twice, in 2010 and 2017, losing each time to the eventual champion, Francesca Schiavone and Jelena Ostapenko, respectively.
This will be the first Grand Slam Wozniacki contests as a Grand Slam champion, and it will remain to be seen whether she can adapt to the pressure well.
She is capable of winning the title, but anything beyond the quarter-finals will be a surprise.
What is the foot injury that has troubled Rafael Nadal over the years? Check here