Maria SharapovaAna IvanovicMaria Sharapova of Russia and Ana Ivanovic of Serbia sustained foot injuries during the Cincinnati Open, both while playing against Kim Clijsters.

Sharapova, ranked No. 12, aggravated a heel injury in the championship match against Clijsters. “I felt some pain in my foot late in the second set which kind of scared me so I have been forced to pull out of Montreal,” Sharapova wrote on her official website. “I am hoping I just need a few days of rest.”

Clijsters had advanced after Ivanovic, ranked No. 39, retired from their semifinal matchup due to a foot injury.

Both Sharapova and Ivanovic are expected to compete in the upcoming U.S. Open, however they will be resting until them. Sharapova withdrew from the Rogers Cup in Montreal to give herself more time to recover.

Also fighting the injury bug are sisters Serena and Venus Williams

Serena is still battling the cut on her right foot from broken glass at a restaurant which required surgery. Venus withdrew from next week’s WTA tournament in Montreal on Friday, citing an injured left knee that is hampering her preparation for the U.S. Open. She had already pulled out of the Cincinnati Open.

If there are no further withdrawals, the tournament will have 40 of the top 45 players in the world.