Serena returns to top 10; Stanford men rise to No. 6

   Serena Williams returned to the top 10 this week for the first time since July 2017.
   Williams, a 37-year-old part-time resident of Silicon Valley, rose one spot to No. 10. She has not played since reaching the quarterfinals of last month's Australian Open, but other players have failed to defend their ranking points.
   Williams went on maternity leave after winning the 2017 Australian Open and returned in March 2018. She fell as low as No. 491 last March before advancing to the Wimbledon and U.S. Open finals.
   Sloane Stephens, a 25-year-old Fresno product, improved one spot to a career-high No. 3. Naomi Osaka remained No. 1, and Simona Halep rose one notch to No. 2.
   College rankings -- The Stanford men (7-2) jumped from No. 10 to No. 6 after beating then-No. 4 Florida 4-1 on Sunday in the consolation bracket of the ITA National Men's Team Indoor Championship in Chicago.
   Cal (2-3), which stunned then-No. 5 USC 4-3 in Los Angeles on Feb. 9, went from unranked to No. 40.
   Stanford's Axel Geller fell three places to No. 13 in singles, and Cal's Yuta Kikuchi and Jacob Brumm dropped five spots to No. 13 in doubles.
   In the women's team rankings, defending NCAA champion Stanford (5-1) slipped one place to No. 4, and Cal (4-1), which shocked then-No. 7 Pepperdine 4-3 in Malibu on Saturday, rose one notch to No. 24.
   Stanford's Michaela Gordon, a sophomore from Saratoga in the San Francisco Bay Area, improved seven spots to No. 16 in singles. She defeated then-No. 19 Eden Richardson, who won the NCAA doubles title last year with LSU teammate Jessica Golovin, on Feb. 8.
   The Cardinal's Emily Arbuthnott fell five places to No. 19, and Cal's Olivia Hauger jumped eight spots to No. 20. Hauger topped Pepperdine's Evgeniya Levashova, who was ranked No. 13 at the time.
   Cal's Anna Bright and Jasie Dunk slipped one notch to No. 23 in doubles.