The American won her two qualifying matches over the weekend and will face Zarina Diyas in her opening-round match.
The Philadelphia Freedoms clinched a playoff spot and the New York Empire moved closer.
Two-time Grand Slam champion withdraws from Washington, DC over visa problems.
The World No.1 said in a statement that he needs time to fully recover from the grass-court grind.
The WTT's first CBS Broadcast became the most-watched in the league's 44-year history.
The American will make her first WTA-level appearance of 2019.
Nick Kyrgios escalates feud X'ing out world No. 1.
