The International Tennis Federation has confirmed the postponement of the Fed Cup finals and play-offs, which were due to be held in April.
Elina Svitolina needed three hours to edge Marie Bouzkova in the Monterrey Open final.
Top seed Elina Svitolina crushed Arantxa Rus to move into the Monterrey Open final.
Elina Svitolina moved through to her first semi-final since the WTA Finals thanks to Friday's win over Leylah Fernandez.
Having come close to a shock defeat on Thursday, Sofia Kenin went through another rough patch before securing her semi-final place in Lyon.
Elina Svitolina and Johanna Konta, the top two seeds at the Monterrey Open, reached the last eight.
Jacqueline Cristian had former doubles partner Sofia Kenin on the ropes, but the Australian Open champion emerged triumphant in Lyon.
American fifth Sloane Stephens seed was upstaged by Leylah Fernandez, who rallied past the 2017 US Open champion in three sets midweek.
After a couple of tough weeks, Sofia Kenin came through her opener in Lyon against Vitalia Diatchenko.
Continuing her comeback in Monterrey, Kim Clijsters was beaten by Johanna Konta in the opening round.