Serena Williams is dejected during her match against Jelena Ostapenko in Abu Dhabi on Saturday. PIC/Getty Images

A slow moving Serena Williams made an encouraging return to tennis after maternity leave, taking a set off the French Open champion Jelena Ostapenko in an exhibition match on Saturday, but said she has not made up her mind about defending the Australian Open title. In a match featuring a super tie-break and lasting one hour and seven minutes, Ostapenko won 6-2, 3-6, 10-5. The American was making a comeback after taking nearly 11 months off to have her first child.