The place to be: WTA Tour exclusively on U.S. soil through end of March

Beginning this week with action in San Diego and Austin, the United States is the exclusive home of the WTA Tour through the end of March. The nation's five-week stretch in the solo spotlight continues with the Indian Wells and Miami WTA 1000s next month, and follows back-to-back weeks with stateside ATP Tour events in Dallas and Delray Beach.

Five Americans dot the San Diego WTA 500 singles draw, led by top seed Jessica Pegula and third seed Emma Navarro. Pegula, who is also the No. 1 seed in the event's doubles draw alongside compatriot Desirae Krawczyk, is playing in her first tournament since the Australian Open. It's also her first event with a new coaching team, having split with longtime coach David Witt in early February.

Now working with Mark Merklein and Mark Knowles, Pegula was sharp in her first competitive action in more than a month, scoring a 6-0, 6-4 win against German qualifier Jule Niemeier in her singles opener. She is also through to the doubles quarterfinals with Krawczyk.

"I haven't played a tournament since Australian Open, so I knew I was going to be a little nervous and things were going to be weird," Pegula said after her singles win.

"But then I came out playing really well. I don't think she was playing her best, but I came out really strong."

Seven Americans are among the 32-player WTA 250 singles draw in Austin, including second seed Sloane Stephens, third seed Danielle Collins and seventh seed Peyton Stearns. Both Stephens and Collins notched straight-sets opening wins, with the latter set to meet countrywoman Katie Volynets on Thursday for a place in the quarterfinals.

Paul beat Marcos Giron in an all-American final at the Dallas ATP 250, while Fritz emerged from an all-American final four to successfully defend his Delray Beach crown. Fritz knocked off Giron and then Paul in the final two rounds at the ATP 250, while Paul defeated Frances Tiafoe to back up his Dallas triumph with another final run.

American Robert Galloway also won his first tour-level title in Delray Beach, teaming with Great Britain's Julian Cash for the milestone result.

While none of this week's three ATP Tour events are being played in the U.S., the men's tour will return to combine with the WTA Tour in Indian Wells, where main-draw play will run from March 6-17. The Sunshine Double will continue for both tours in Miami from March 19-31.