Top-ranked Novak Djokovic defeated Nicolas Almagro 6-3, 6-4, winning the final three games of the match to reach the semifinals of the BNP Paribas Open on Thursday.
Ana Ivanovic earned a spot in the women's semifinals with a 6-3, 6-4 victory over Marion Bartoli, the 16th-ranked Serb's second straight win over a top-10 player.
Defending champion Djokovic improved to 16-1 against Spanish opponents since the start of 2011, although Almagro made him work for it on another 80-degree day at the Indian Wells Tennis Garden. Almagro held with a backhand winner down the line to go up 4-3 in the second set.
Djokovic served at 40-love in the next game before Almagro rallied to reach deuce. Djokovic held, then broke Almagro in the next game and served out the match with a 40-love game that ended with his own backhand down the line.
Ivanovic had knocked off defending champion and fourth-ranked Caroline Wozniacki in straight sets in the fourth round. Ivanovic is trying to regain the form that made her No. 1 in 2008, when she won her only Grand Slam title at the French Open and won at Indian Wells.
She will next play the winner of an all-Russian quarterfinal between Maria Sharapova and Maria Kirilenko.
American John Isner took on Gilles Simon of France at night.
Bartoli, runner-up here last year, requested a doctor for an on-court evaluation early in the second set. She said she began feeling sick on Wednesday night and suspected she has the same viral illness that derailed several players during the two-week tournament.
"Even though we didn't have very long rallies, I was feeling really out of breath," she said. "Then I was having a lot of joint pains and feeling shaky and very cold. It was quite hot, so I knew I was not in a good shape. Even though I lost it, I just felt like I needed to stay there until the end."
Bartoli broke Ivanovic to open the match, then Ivanovic took control and broke to open the second set before finishing it off in less than 1 1-2 hours.
Ivanovic moved into her first semifinal of the season, having reached the quarterfinals in Dubai and losing in the fourth round of the Australian Open. She won one title late last year at Bali. After her big year in 2008, Ivanovic dropped out of the top 20 in October 2009, falling as low as No. 65, before returning to the top 20 at the end of 2010.
"When you're young and upcoming you don't have these experiences. You don't know what to expect or what the consequences are," the 24-year-old Serb said. "Then with so many experiences and everything, it does help you at some points, but also it sometimes creates a doubt because you analyze and think too much. But I'm just very happy that the work I put in is paying off and I'm starting to put it together in matches, in the big matches, too."