Venus and Serena Williams in 2014
TIMOTHY A. CLARY/AFP/Getty Images

Serena Williams once again showed up against big sister Venus Williams at Wimbledon, beating her in straight sets, 6-4, 6-3, to reach the quarterfinals and extending her career victories over her older sister to 15-11, the Associated Press reports.

"It's hard to feel excited about [beating] someone you root for all the time no matter what, and who you love so much and she's your best friend in the world," Serena said, according to AP. "It's never easy, but you just play for the competition and enjoy the moment."

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As AP notes, both sisters have won Wimbledon five times, but Serena leads with a total of 20 grand-slam singles titles.

If Serena wins Wimbledon, only the U.S. Open stands between her and the honor of becoming the first player to complete a calendar-year grand slam since 1988, when Steffi Graf made a clean sweep of all four majors in the same season.

"I think I served well today," she said of her win against her sister. "I didn't hit huge serves, I hit one big serve. But other than that, I think I just was really consistent with my serve. She was playing really well, so at the end I was able to come through."

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The tennis star reflected on playing against her sister, acknowledging that the sisters may not have many moments left to face off across the court.

"It definitely doesn't get easier," Serena said, according to AP. "But today I was out there and I just thought, 'Wow, I'm 33 and [Venus] just turned 35. I don't know how many more moments like this we'll have.'

"I plan on playing for years, but you never know if we'll have the opportunity to face each other. I just took the moment in and I thought, 'We're at Wimbledon.' I remember when I was 8 years old; we dreamed of this moment, and it was kind of surreal for a minute there," she added.

Read more at the Huffington Post.