Maria Sharapova is frustrated and motivated by her losing run against Serena Williams after it stretched to 18 matches with a quarter-final loss at the Australian Open.
The Russian five-time grand slam champion pushed hard early on Rod Laver Arena on Tuesday before suffering a 6-4 6-1 loss to Williams.
Sharapova now holds a 2-19 win-loss record against the American world number one, but said that would just encourage her to get better.
"It's obviously always frustrating. I mean, it's motivating. It's tough to sit here 30 minutes after the match and talk about the match, but that's part of my job," she said.
"It's motivating because she's at a different level. She makes you go back to the drawing board, not just for me, but for many other players. She makes you work. That's inspiring."
Williams made a slow start in the last-eight clash, but Sharapova was unable to build on a 2-0 lead before losing the first set in 55 minutes.
The second was far more straightforward for the 21-time grand slam champion, who dominated to remain unbeaten against Sharapova since 2004.
Sharapova described Williams' performance as "explosive", but is eager to keep creating chances to overcome her rival.
"Keep setting opportunities. Keep getting to the point where I have an opportunity to play against her. Keep finding a way to turn that around," she said.
"If I don't have that chance then I don't have the opportunity to try something different."