Sunday, Third Round
 Li Na (CHN #2) vs. Madison Keys (USA #38)
Head-to-head: Tied 1-1
Madison Keys surely has fond memories of her last match against third round foe Li Na, as it was arguably the signature moment of her young career. She was informed she had gotten into the Madrid draw last May as a lucky loser just a few minutes before her first round tilt with the then-World No.5. She promptly disposed of Li in surprisingly easy fashion, 63 62. That is the American teen's lone win in five matches against Top 5 opponents so far, so another victory over the now-No.2 Li would represent her best win yet. Keys has been impressive so far this week, with two straight set triumphs, including one over former Top 5 player Daniela Hantuchova in the second round.
Li is in the unusual position of being through to the third round without having taken the court, as she had a bye in the first round and second round foe Alisa Kleybanova withdrew from the tournament before their match. The Chinese superstar did have a nice run at her last event in Indian Wells, reaching the semifinals, and takes a 17-2 record on the season into her clash with Keys.
 Caroline Wozniacki (DEN #18) vs.  Sloane Stephens (USA #16)
Head-to-head: Wozniacki leads 3-0
Though she is ranked two spots lower than Sloane Stephens, Caroline Wonziacki is seeded six spots higher and should be the favorite based on their series history. The Dane won all three of their matches in straight sets, and all of them occurred in a similar setting as Miami - outdoor hardcourts.
Stephens, who turned 21 on Thursday, is looking for her 150th win as a pro. The American had her best outing of the season so far with her quarterfinal appearance in Indian Wells last week. She also was more impressive in her opener here than Wozniacki, getting through Zarina Diyas in straight sets, while Wozniacki needed three sets to get past Monica Puig.
 Venus Williams (USA #31) vs. [WC] Casey Dellacqua (AUS #56)
Head-to-head: Williams leads 1-0
Venus Williams comes into her encounter with Casey Dellacqua in superb form, as dating back to her title run at her last event in Dubai, she has now won 12 straight sets. And being in top form in Miami is hardly a new trend for her, with her second round win improving the three-time Sony Open Tennis champion and one-time runner-up to 53-10 here.
Dellacqua is playing well of late too, having made the quarterfinals as a qualifier at Indian Wells - the furthest she has gone in a tournament since her semifinal showing at Dallas in August 2012.
Find the listings for Sunday's play on the WTA TV developed by Xerox.