American tennis star Serena Williams lost 1-6, 0-6 in 12 straight games to unseeded Johanna Konta of Britain in the first round of San Jose Tournament.
The 36-year-old said that she is capable of playing a 'zillion times' better than the English player after an embarrassing defeat.
"I'm taking everything a day at a time. I think she played better in this match than she did in about 18 months, so I think that's a good thing for her. I know I can play a zillion times better," Williams said.
The 23-time Grand Slam champion admitted that she was not playing her best game but asserted that she does not have any time to be shocked about the loss. "I have so many things on my mind, I don't have time to be shocked about a loss. I clearly wasn't at my best. I can only try to be there," she said.
"When I was out there, I was fighting. I wasn't just giving it away. I was moving a lot better - I'm just trying to take the positives," she added.
Meanwhile, reflecting on her stunning victory against the former world number one, Konta said that Williams was clearly not at her best and it gave her the chance to play the game on her own term.