Serena and Venus Williams will walk the slippery line between sisterly affection and athletic aggression for the 30th time tomorrow, fighting for a place in the US Open last 16.
The superstar sisters' third-round clash is their earliest Grand Slam meeting in 20 years -- since Venus beat her younger sister in the second round of the 1998 Australian Open in their first career meeting.
"I never root against her, no matter what," Serena said.
"So I think that's the toughest part for me. When you always want someone to win, to have to beat them ... I know it's the same thing for her.
"When she beats me, she always roots for me as well. I think that's just the hardest part."
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