By Caroline Cheese
BBC Sport at Wimbledon
Venus Williams looks to continue her recent resurgence as the women take centre stage at Wimbledon on Tuesday.
Williams has found better form following a disappointing season but faces her toughest test yet against French Open finalist Mary Pierce.
Their quarter-final follows third seed Amelie Mauresmo's encounter with Anastasia Myskina on Centre Court.
On Court One, Maria Sharapova faces Nadia Petrova before top seed Lindsay Davenport takes on Svetlana Kuznetsova.
Williams is without a Grand Slam title since her second Wimbledon win in 2001 and she has lost her place in the world's top 10.
However, she believes she is in the right form to challenge for the title again.
"My game is good," she said. "I feel like I'm raising to the next level if things get tight in matches.
"I always expect to be better, but my goal is just one round at a time. It's that simple."
Like Williams, Pierce is going through a revival, following up her surprise run to the final in Roland Garros with only her second appearance in the last eight at the All England Club.
The 30-year-old Frenchwoman has lost six of nine previous meetings with Williams, but triumphed in their most recent match at the Olympics last year.
Whoever triumphs will face Sharapova or Petrova in the semi-finals.
Defending champion Sharapova will be confident of beating her Russian compatriot after dropping 17 games so far in four matches.
In the top half of the draw, third seed Mauresmo has avoided the headlines on her way to the last eight and makes her first appearance on Centre Court this year.
The Frenchwoman said: "I don't really care (about not getting attention). I know what my game is and I know what my weapons are on this surface."
In Myskina, she faces another player putting together a good run of form after a dreadful start to the season.
The Russian went out in the first round at the French Open as defending champion, but has battled into the quarter-finals at SW19 for the first time in her career.
Davenport, the world number one, admits she will find it hard to lift herself against Kuznetsova after hitting top form in her win over Kim Clijsters on Monday.
"It's tough when you play really tough matches so early, I'm going to have to come down from my little high and start again," Davenport said.
"I'm still only in the quarter-finals, there's still a long way to go."