Agnieszka Radwanska, Eugenie Bouchard and Shelby Rogers will join Caroline Wozniacki as wild cards in New Haven, the tournament announced.
The tournament would be Radwanska's fourth event in five weeks, while Bouchard would be playing her fifth event in six weeks. Both have played New Haven before, Radwanska six times and Bouchard three times. Rogers reached the quarterfinals of French Open this season, and is the only American to receive a wildcard.
Four-time New Haven champion Wozniacki had been previously announced as a wild card. Her ranking has dropped to No. 51, partly due to being sidelined between Miami and the grass-court tournaments with an ankle injury, then with an arm problem at Washington.
Defending champion Petra Kvitova is also scheduled to be at the tournament.