Martina Hingis is missing the ongoing French Open due to injury. However, I found on a website martinaworld.com that she will play the $175,000 Ordina Open in 's-Hertogenbosch, Holland. This Tier III event starts June, 18. It's played on grass. The world number 6 won this tournament in 2000, the only time she competed there.
After the event in Holland, we will watch Martina play at Wimbledon, which starts a week later.