Serena Williams of United States looks on during her Ladies Final match against Jelena Ostapenko of Latvia on day three of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 30, 2017 in Abu Dhabi, United Arab Emirates.

Serena Williams of United States looks on during her Ladies Final match against Jelena Ostapenko of Latvia on day three of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 30, 2017 in Abu Dhabi, United Arab Emirates.

*After giving birth to her first child in September, Serena Williams made her return to professional tennis on Saturday and lost an exhibition match in the United Arab Emirates to French Open champion Jelena Ostapenko.

Williams called it a “wonderful” match despite the defeat — she took the second set in a score of 6-2, 3-6 and 10-5 in a super tiebreaker – but is still unsure if she will defend her Australian Open title.

The Australian Open, this year’s first Grand Slam tournament, begins Jan. 15.

“I don’t know if I am totally ready to come back on the tour yet. I know that when I come back I definitely want to be competing for championships. I am definitely looking forward to getting back out there,” Williams said at the Mubadala World Tennis Championship.

“I am taking it one day at a time. I am going to assess everything with my team before deciding.”

Williams, 36, stepped away from the circuit after winning the Australian Open last January while pregnant. She gave birth to her first child, a girl named Alexis Olympia Ohanian Jr., on Sept. 1. She married Reddit co-founder Alexis Ohanian in November.

Watch Serena’s post-match press conference above.

More details of the match below via The Associated Press:

Williams struggled with her serve in the 67-minute match at the Mubadala World Tennis Championship. But, after nearly a year away from the game, she did win a set against the world’s No. 7 player

“I don’t think I am going to rate my performance,” Williams said. “I have plenty of comebacks, from injuries, from surgeries, but I’ve never had a comeback after actually giving birth to a human being. So, in my eyes, I feel it was a wonderful, wonderful match for me.”

Williams insisted she has a lot more tennis to play. “Knowing that I have won 23 Grand Slam titles and several other titles, I don’t think I have anything more left to prove,” she said. “But I am not done yet.”

Williams won her opening game, breaking Ostapenko. But she was nowhere near her best in the first set before fighting back and winning the second.

After the initial break, Ostapenko latched onto Williams’ weak serves and capitalized on several unforced errors to go up 4-1 with two breaks.

Williams again struggled with her serve in the second set. But she went ahead 3-0 with a couple of early breaks and hit with more confidence, including several crowd-pleasing double-handed passing shots. Another break in the ninth game gave her the set.

“In the beginning, it felt a little tough. But as the match moved on, I was less afraid. I knew I was not going to fall over and break,” she said. “The more I played, the more confident I felt that I would be able to go for shots that I was afraid to go for in the first set.”

In the super tiebreaker, Ostapenko raced to an 8-2 lead before halting a brief recovery by Williams.

“For me, it is all about physical, how I am feeling physically…. I am just proud being out here and playing in Abu Dhabi and to be able to just compete,” Williams said. “I have had a tough few months and I am just excited to be able to play again.”

It was the first time a women’s match had been played in the traditionally men’s only exhibition.