Serena Williams loses to woman ranked 116th; Coco Gauff wins

“It’s good to know,” Williams said, “I can play a lot, lot, lot better.”

She’ll want to do so soon: The U.S. Open begins Aug. 31.

Rogers will face Switzerland’s Jil Teichmann, who needed seven match points to beat Atherton’s CiCi Bellis 6-2, 6-4.

Also, American Coco Gauff, 16, reached her second WTA semifinal with quite a comeback. One point from trailing by a set and two breaks, Gauff won 10 of the last 11 games to eliminate No. 8 seed Ons Jabeur 4-6, 6-4, 6-1.

• Top-seeded Simona Halep cruised past Magdalena Frech 6-2, 6-0 to advance to the semifinals of the Prague Open.

Bayern humbles Barcelona 8-2

Bayern Munich handed Barcelona the most humiliating defeat of the Lionel Messi era and among the worst in its history, 8-2, to reach the Champions League semifinals in Lisbon, Portugal.

Thomas Muller scored twice and Ivan Perisic and Serge Gnabry had goals in the first half, then Joshua Kimmich, Robert Lewandowski and Philippe Coutinho (twice) piled on in the second as Barcelona conceded eight goals for the first time since 1946 .

Golf: Tom Hoge maintained a share of the lead at the PGA Tour’s Wyndham Championship, this time alongside Si Woo Kim, Talor Gooch and Billy Horschel in Greensboro, N.C. Hoge shot 2-under-par 68 to get to 10-under par.

• Jerry Kelly was the only player at par or better after two days on Firestone’s difficult South Course in the Bridgestone Senior Players Championship in Akron, Ohio, the PGA Tour Champions’ first major of the season. Kelly shot an even-par 70 in tricky wind conditions to remain at 2-under.

• American Stacy Lewis shot 5-under 66 for the lowest round of the week at the Ladies Scottish Open in North Berwick, to take a share of the lead at 5-under with Azahara Muñoz (69) after the second round. San Francisco-born Danielle Kang, bidding for a third straight LPGA Tour win, is even par after two rounds of 71.

• Sam Horsfield shot 7-under 64 to take a one-stroke lead at 11-under after the second round of the European Tour’s Celtic Classic in Newport, Wales.

WNBA: In Bradenton, Fla., Breanna Stewart scored 21 points as the Seattle Storm beat the Dallas Wings 83-65 for their seventh straight victory. ... Alyssa Thomas had 15 points, 10 rebounds and eight assists and the Connecticut Sun held off the Chicago Sky 77-74. ... Bria Hartley’s 24 points got the Phoenix Mercury by the Atlanta Dream 96-80.

Track and field: Uganda’ Joshua Cheptegei broke a 16-year-old world record to win the men’s 5,000 meters in 12 minutes, 35.36 seconds at Monaco’s Diamond League meet. Cheptegei was 1.99 seconds better than the 12:37.35 set by Kenenisa Bekele of Ethiopia in 2004.