Hailey Baptiste turned a year of steady progress into a defining moment in Miami, posting the biggest win of her career to reach the Round of 16 at a WTA 1000 event for the first time.

The 24-year-old American defeated world No. 9 Elina Svitolina 6-3, 7-5 on Sunday, handing the Ukrainian the most significant upset of the tournament. Baptiste’s victory was her second career Top 10 win; her first came against a hampered Barbora Krejcikova in Wuhan in 2024. Beating the player who entered Miami with the most match wins on either the ATP or WTA this season proved a strong statement.

“You can’t get to this point without doing the right things, and I’ve definitely been putting in a lot of work off the court and on the court, behind the scenes, and it’s clearly showing up,” she told reporters afterwards. “I’ve been here for a while, everybody pretty much knows what I can do and it’s time for me to show it, I guess.”

The result is the latest milestone in a surge that began last summer with Baptiste’s first Grand Slam fourth-round at Roland Garros. In 2026 she reached the third round of the Australian Open for the first time and recorded her first WTA 500 semifinal in Abu Dhabi, where she was a point away from the final before losing a tight three-setter to Ekaterina Alexandrova.

Three days after that Abu Dhabi semifinal, the day she first entered the Top 40 at No. 39, Baptiste split with coach Eric Hechtman, who took over the reins from Franklin Tiafoe, Frances’ brother.

Baptiste says her recent climb has been driven as much by internal conviction as by changes around her.

“I’ve always kind of known how I should play, and you know there’s moments where maybe I don’t trust it as much, and right now, the last few months and over the past year, I’ve just been trying to trust my game and trust myself as much as possible. Obviously, belief is a huge part of getting wins,” she said.

A win against Ostapenko in the next round would lift Baptiste past her previous career-high ranking and move her closer to the Top 30.

This preview focuses on three matches at the Miami Open that carry real significance for form and momentum.

Tiafoe vs Mensik
Tiafoe and Mensik shared similar arcs last year: Tiafoe reached a season-high No. 11 last July while Mensik rose to a career-high No. 16 a month later. After those peaks, both struggled and saw their rankings fall, with Tiafoe slipping as low as No. 30. Their 2026 returns have been strong: Tiafoe is 13-6, reached the final at the 500 in Acapulco and has re-entered the Top 20. Mensik is 14-5, won a title in Auckland and hit a career-high No. 12 this month. Tiafoe credits new coach Mark Kovacs for toughening up his training. “I got a little bit of a drill sergeant right now in Mark,” he says of Kovacs. “If you have a coach that’s stern and on you, man, you’re like, ‘I’ve got to wake up, and I gotta do it.’” “It’s starting to come together, and it feels good.” Mensik is defending 1000 champion’s points from 2025, while Tiafoe faces his last hard-court chance at home until July. They met once in Davis Cup last year, Mensik winning 6-1, 6-4. At 6’5, Mensik can be devastating when his serve is clicking; Tiafoe brings a more varied game and renewed enjoyment of the grind. Winner: Tiafoe

Andreeva vs Mboko
Both teenagers are already Top 10 players and this will be their third singles meeting of 2026. They have also teamed in doubles at Indian Wells and Miami. They split their first two matches: Andreeva won the Adelaide final earlier in the year; Mboko edged the Doha meeting 7-6 in the third set in the third round. Records this year favor Mboko (18-5) over Andreeva (14-5). Andreeva offers excellent defensive range and a clean backhand but can be volatile. Mboko runs well, hits deceptively hard from both sides, shows fewer emotional swings and has a knack for comebacks. On fairly quick hard courts and with a supportive crowd expected, pick Mboko. Winner: Mboko

Bencic vs Anisimova
Both were touted as teen prodigies who have rebuilt careers. The American is ranked sixth and the Swiss is 12th, making this a high-powered fourth-round matchup. They are 2-2 head-to-head, with Bencic winning their only meeting in the last three years in Indian Wells last spring. Anisimova is an attacker with a 5’11 frame and excellent timing who often belted the ball at top speed. Bencic is a counter-puncher and power-absorber with soft hands and court sense who likes to take opponents’ pace and redirect it.

Talia Gibson has extended a startling run of form, following her breakthrough at Indian Wells with a commanding performance in Miami. The 21-year-old Australian advanced to the fourth round of the WTA 1000 event after a 6-2, 6-2 victory over Iva Jovic.

Gibson served strongly throughout the match. She did not face a break point across eight service games and won 81% of second-serve points against the Australian Open quarterfinalist. That service display underpinned a routine scoreline and a straight-sets win.

The result is part of a remarkable three-week stretch. Gibson has won 11 of her last 12 matches, six at Indian Wells (two in qualifying and four in the main draw) and five in Miami (two in qualifying and three in the main draw). Those matches have come against high-caliber opponents: she had never beaten a Top 50 player before Indian Wells, where she began a run that has seen her go 7-1 against Top 50 players across Indian Wells and Miami.

All eight of her main-draw matches at the two WTA 1000 events were against Top 50 opponents. Her only loss in that span was to Linda Noskova in the Indian Wells quarterfinals, a three-set result in what the draft called tennis paradise last week.

With Sunday’s victory, Gibson is 5-1 against Top 20 players in the last three weeks and 5-2 against them for her career. Her prior Top 20 meeting was a 6-1, 6-0 loss to No. 12 Paula Badosa in the second round of the 2025 Australian Open.

Indian Wells propelled Gibson into the Top 100 for the first time this past Monday, rising from No. 112 to No. 68. How she finishes in Miami could determine whether she climbs further into the Top 50.