The field has opened up for a player like Wozniacki, and I expect her to take advantage of the opportunity.
Wozniacki missed the 2016 French Open because of an ankle injury.
Nadal continued his ruthless form at Roland Garros by dispatching Spanish 17 seed Roberto Bautista Agut 6-1, 6-2, 6-2 to match Roger Federer's mark of last-eight appearances in Paris.
Eighth seed Nishikori led two sets to one but trailed by a double break at 3-0 down in the fourth set when rain halted play yesterday. Wozniacki has won no less than 43 percent of her return points and has broken her opponents a combined 22 times.
"Obviously you never know what's going to happen, but at the same time. she's one of those youngsters I see working very hard, and fighting for every point".
Sunday's clash was their first on clay.
In other matches at Roland Garros, Alize Cornet easily defeated ninth-seeded Agnieszka Radwanska 6-2, 6-1 to set up an all-French fourth round against Caroline Garcia.
The value is with Ostapenko and the plus money given how she's played up to this point and the fact she's beaten Wozniacki in all three meetings, twice on clay.
"Svetlana's a great player, especially on clay so I knew it wouldn't be easy", said Wozniacki, a two-time US Open runner-up.
Karolina Pliskova, the Czech second seed, is also into round four after she beat Carina Witthoft of Germany 7-5 6-1.
Next up for Svitolina is Croatian qualifier Petra Martic, who upset Latvian 17th seed Anastasija Sevastova 6-1 6-1.
"When I got injured, my only hope was that I would get a second chance so I can play some of my best tennis again", said Martic.
"I still can't believe that I'm sitting here".