The Capitals blew a late lead Thursday and suffered their sixth consecutive loss, 20-19 in a Supertiebreaker to the host Springfield (Mo.) Lasers.
Sacramento's Olga Govortsova and Megan Moulton-Levy served for the match at 19-17 against Vania King and Alisa Kleybanova, the top women's doubles team in the league.
But King, a former Capital, and Kleybanova broke serve to tie the set at 4-4. That forced a tiebreaker, which the Springfield pair won 5-1 to even the match at 19-19 after regulation and send it to a Supertiebreaker.
King and Kleybanova, a former top-20 singles player who returned in May from a two-year battle with Hodgkin's lymphoma, prevailed 7-2 to keep Springfield tied for first place in the Western Conference with Orange County at 6-3.
Sacramento (3-6) must win its five remaining regular-season matches to keep its slim playoff hopes alive. The Capitals visit Boston (3-6) tonight.
Wimbledon champion Marion Bartoli withdrew from the Bank of the West Classic at Stanford because of a hamstring strain.
"During Wimbledon, I developed a strain in my hamstring, which has not healed over the past two weeks," said Bartoli, the 2009 Bank of the West winner. "I have been receiving therapy and was optimistic that I would be able to participate.
"It is one of my favorite tournaments on the circuit. Unfortunately, the injury has not completely healed, and I will be unable to participate."
Bartoli is the second prominent player to pull out of the tournament this week. Maria Sharapova withdrew because of a left hip injury suffered during Wimbledon.
Bartoli's withdrawal open- ed a spot for former Stanford All-American Mallory Burdette in the main draw.
Burdette turned pro after reaching the third round of the U.S. Open last year.
Bee Sports staff