Seven top-10 players, including Iga Swiatek, will take their place in next week's loaded San Diego draw.
The Russian said he felt he would be risking too much by continuing.
Mery Perello gave birth to a baby boy on Sunday morning, Spanish media reports.
Former world No. 1 Andy Murray joins a pair of Spaniards as wild card recipients for the Gijón Open.
The Aussie might not make it to Turin, but he has had a wildly successful season nevertheless.
The American icon lights it up as British Glamour's October covergirl
The British star has reportedly elected to call it a season.
