CHARLESTON, S.C. —What a week for the Williams sisters.

Serena gained a title, Venus found a renewed belief in her game and both showed a calm confidence at the Family Circle Cup.

Serena capped a dominant week with a powerful performance in the finals Sunday, defeating Lucie Safarova 6-0, 6-1 to win the championship. It was Serena Williams’ 40th career tournament title and her first win on clay since taking this event in 2008.

Sister Venus has similar hopes. The 31-year-old star and seven-time grand slam winner was playing just her second tournament since an autoimmune disease— Sjogren’s syndrome—kept her sidelined for more than six months.

Venus Williams reached the quarterfinals in her return, showing off some solid tennis of her own in her first clay-court event in two years. Venus nearly made it to the semifinals, missing out on her first matchup with Serena since 2009 when Samantha Stosur rallied to win.

Then Serena got a bit of sisterly revenge, ousting Stosur in dominating 6-1, 6-1 fashion.