In a boost for the tournament and hopefully for the players to gain form, Andy Murray, Stan Wawrinka and Dominic Thiem will play BNP Paribas Primrose Bordeaux, a challenger pre French Open.
Taking place between 14-20 May, Murray will play at both Madrid and Rome with the latter starting only days before.
He has endured a nightmare run in Miami and Monte-Carlo but needs to keep playing and winning ahead of Wimbledon.
Wawrinka has also shown a dip after initial early promise making early exits in Monte-Carlo and Banja Luka.
While Thiem has shown signs recently in Estoril and Munich but is still some way away from recapturing his form.