Serena Williams is expected to play two matches at Wimbledon as Week 1 wraps up, first in singles and later with partner Andy Murray in mixed doubles. The seven-time singles champion will face 18th-seeded Julia Goerges in the third round on No. 1 Court on Saturday, a rematch of a semifinal last year that Williams won. Williams and Murray were supposed to debut as a team Friday, but that was postponed. They likely will get on court Saturday evening. Roger Federer and Rafael Nadal are scheduled for matches on Centre Court as third-round play concludes before Sunday's traditional day off. Nadal faces Jo-Wilfried Tsonga, before Federer plays Lucas Pouille. Also on Centre Court: French Open champion and No. 1 seed Ash Barty against unseeded Harriet Dart of Britain. (For more sports news and updates, follow Ahram Online Sports on Twitter at @AO_Sports and on Facebook at AhramOnlineSports.)