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10hPeter Bodo

Bodo: Sluggish Williams holds off Lisicki

As Serena Williams proved against Sabine Lisicki in the Miami Open quarterfinals, it's not how many points you win, but when you win them.

Miami Open

Serena on win: 'I just try to problem-solve' (1:15)

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11h

The Most Important Female Athletes Of The Past 20 Years

In honor of ESPN.com's 20th birthday, we asked our experts to choose the most important female athlete of the past two decades. Here are the brilliant performers who had the drive, flair and character to change the way we think of women's sports.

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8h

Center Court: Isner's tough quarter

ESPN's Jim Basquil talks to Peter Bodo about what John Isner has to do to step up and top world No. 5 Kei Nishikori in the Miami Open quarterfinals.

Now

Two-time champion Andy Murray advanced to the semifinals of the Miami Open by rallying past unseeded Dominic Thiem 3-6, 6-4, 6-1 on Wednesday.

Venus Williams' recent resurgence stalled when she lost in the quarterfinals to No. 12-seeded Carla Suarez Navarro 0-6, 6-1, 7-5 on Tuesday at the Miami Open.

Tennis: American Sloane Stephens faces No. 3 seed Simona Halep in quarters of Miami Open at 7 pm ET on ESPN2/WatchESPN

Two-time champion Andy Murray advanced to the semifinals of the Miami Open by rallying past unseeded Dominic Thiem 3-6, 6-4, 6-1 on Wednesday.

Serena: 'Today wasn't my best day'

Serena Williams, after beating Sabine Lisicki in three sets in the Miami Open quarterfinals: "I just told myself, I'm not serving the way I normally serve and hitting the way I normally would hit, so at this point all I can do is just fight and try to give 200% instead of 100%."

AP

Brad Gilbert @bgtennisnation

Wow home Thiem takes the 1st vs Muzzard this young fella is cracking the ball huge, now can he pull the big upset alert

Serena struggling in second set

World No. 1 Serena Williams won the first set narrowly but is down in the second 5-1 against Sabine Lisicki in their quarterfinal match at the Miami Open. Watch on ESPN2/WatchESPN

AP

Watch: Serena Williams at Miami Open

World No. 1 Serena Williams faces Sabine Lisicki in the Miami Open quarterfinals at 1 p.m. ET. The last time these two met, at 2013 Wimbledon, the German stunned defending champ Williams. Live on ESPN2 and WatchESPN

Clive Brunskill/Getty Images

Watch: Serena Williams at Miami Open

World No. 1 Serena Williams faces Sabine Lisicki in the Miami Open quarterfinals at 1 p.m. ET. The last time these two met, at 2013 Wimbledon, the German stunned the defending champ Williams. Live on WatchESPN

Clive Brunskill/Getty Images

Top 20 athletes of the past 20 years

LeBron. Serena. MJ. Tiger. All great athletes who made the top 10, but who most defined the pinnacle of sports over the past two decades? See who's No. 1

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Venus loses steam at Miami Open

Venus Williams had control early, but Carla Suarez Navarro turned the tables to claim a quarterfinals win at the Miami Open.

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Djokovic avoids upset in Miami

Novak Djokovic dropped the first set and struggled in the second, but was great late in advancing at the Miami Open, joining fellow top seeds Andy Murray and Kei Nishikori in the quarterfinals.

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Chris Fowler @cbfowler

Few "style points" but Isner clutch!W in 3 breakers vs Raonic. Kept me up late! E2 coverage from Miami starts WEDS 1ET w/ Serena

Isner outlasts Raonic in 3 sets

Little separated Jon Isner and Milos Raonic all night, but the American got the better of Raonic, winning 6-7 (3), 7-6 (6), 7-6 (5) to advance at the Miami Open. Isner will face Kei Nishikori in the quarterfinals.

Photo by Matthew Stockman/Getty Images

Suarez Navarro discusses comeback win

Carla Suarez Navarro on her 0-6, 6-1, 7-5 quarterfinals victory over Venus Williams: "It was a crazy match, crazy first two sets. Venus was unbelievable at the beginning. I start a little bit nervous, but, you know, in tennis, even if you lost the first set, you're still in competition."

AP

Isner forces third set

John Isner took the second set in a tiebreak to square up the match at a set apiece with Milos Raonic. A spot in the quarterfinals of the Miami Open is on the line for the two huge servers. Watch live

Mike Ehrmann/Getty Images

Brad Gilbert @bgtennisnation

What chance is this 2nd set with Isman vs missile Raonic not going to a TB, umpire should call players to net right now to get TB started