The first set turned into a drawn-out thriller that was decided only in the tiebreak. Both players had several times the chance to decide but missed crucial set balls.
Before that, 87th-ranked Rebecca Peterson had slopped a bit on her own serve but then tightened up and caught up from a 5-3 deficit.
Nevertheless, it was the 80th-ranked Chinese Wang who finally, after 87 minutes played, won the first set (7-5).
The second set also featured several long duels, but Wang was a bit stronger and had the crowd with him. She will now face either world number one Iga Swiatek from Poland or American Claire Liu (ranked 102) in the third round.
For Peterson, it's the fourth time it's stopped after the second round of the Grand Slam tournament in Paris.