Just days ahead of taking the 2025 US Open court, US tennis star Coco Gauff has reportedly parted ways with coach Matthew Daly, after he helped guide the world No. 3 to her first French Open title earlier this year.

Gauff originally hired Daly, a grip specialist, following a disappointing 2024 US Open run, ultimately finishing out the season by adding 2024 China Open and 2024 WTA Finals hardware to her trophy case.

However, despite her breakthrough performance at this year's Roland Garros, the 21-year-old has struggled with her serve this season, most recently registering 42 double faults across her three matches at the 2025 Canadian Open and 16 in her 2025 Cincinnati Open quarterfinal clash.

In Daly's absence, Gauff will still be working with longtime coach JC Faurel while also adding Gavin MacMillan to her 2025 US Open team — a biomechanics specialist who No. 1 Aryna Sabalenka has credited for helping her find consistency with her serve.

"I'm very much a perfectionist type of person," Gauff recently told reporters. "So it's really nothing satisfying until you're holding the big trophy, to be honest."

Gauff's next shot at a big trophy begins on Sunday, when the main draw of the 2025 US Open — the last Grand Slam of the year — hits courts in Queens, NY.

The 2023 US Open champion will face Australia's No. 84 Ajla Tomljanović in her first-round match.

The 2025 Canadian Open wrapped up with a storybook ending in Montréal, as 18-year-old Canadian Victoria Mboko earned her first-ever WTA Tour title by defeating four-time Grand Slam winner Naomi Osaka in Thursday's final.

"I would have never thought that I would have made it to the final, let alone win the tournament," Mboko said after battling back to take down Osaka 2-6, 6-4, 6-1. "It just proves that your dreams are closer than they [seem]."

The largely unexpected final matchup capped a 2025 Canadian Open that saw every seeded player fall, with Mboko putting together a dream run that included ousting four Grand Slam champions — Osaka, Sofia Kenin, Elena Rybakina, and Coco Gauff.

Thursday saw Mboko become just the third-ever Canadian to win the event, plus the teen phenom made tennis history as only the third wild-card entrant to ever claim victory in a WTA 1000 tournament.

As for Osaka, despite falling just short of the finish line, the 2025 Canadian Open was a distinct return to form for the fan favorite, who put together her most successful tournament run in three years in Montréal this week.

Both finalists earned a significant rankings bump with their performances this week, with Osaka rising to world No. 25 while Mboko, who started the 2025 season outside the WTA's Top 350, skyrocketed to No. 24.

Having withdrawn from the 2025 Cincinnati Open due to the near-impossible turnaround between Thursday's final in Montréal and their Saturday matches in Ohio, both Mboko and Osaka will enjoy some much-deserved rest before gearing up for the season's final Grand Slam — the 2025 US Open.

Four-time Grand Slam winner Naomi Osaka has found her stride at the 2025 Canadian Open, with the 27-year-old fan favorite advancing to the Montréal tournament's quarterfinals as she prepares to chase a third US Open title later this month.

After parting ways with coach Patrick Mouratoglou just 10 days ago, world No. 49 Osaka will contend in her first WTA 1000 quarterfinal in three years on Tuesday, when she'll face off against Ukraine's No. 13 Elina Svitolina for a spot in the semifinals.

"I think I need to pace myself and go for the mini goals, and they'll eventually turn into the big goals," the Japanese star said after topping Latvia's No. 26 Jeļena Ostapenko in the third round on Friday.

Tuesday's other quarterfinal sees US star and 2025 Australian Open winner Madison Keys on the Canadian court, as the world No. 8 takes on No. 19 Clara Tauson after the Danish national upset reigning French Open champion No. 3 Iga Świątek in straight sets on Sunday.

Already punching their tickets to the semifinals are Kazakhstan's No. 12 Elena Rybakina and 18-year-old phenom No. 85 Victoria Mboko — the youngest home-grown semifinalist in Canadian Open history — who each advanced with straight-set victories on Monday.

How to watch Osaka at the Canadian Open quarterfinals

Keys and Tauson will kick off Tuesday's quarterfinals action at 6 PM ET, with Osaka clashing with Svitolina shortly afterward.

Live coverage of the 2025 Canadian Open will continue to air on the Tennis Channel.

With the US Open rapidly approaching — the WTA season's final Grand Slam — the tennis world's hardcourt titans are tuning up at the 2025 Canadian Open.

This year's tournament is in full swing up in Montréal, allowing players to hone their skills before next week's Cincinnati Open sets the tone for the annual New York City Slam.

Though stars like world No. 5 Mirra Andreeva, No. 9 Jasmine Paolini, and No. 11 Emma Navarro stumbled out of contention in the tournament's first two rounds, many heavy-hitters are still in play, including all three 2025 Grand Slam winners: Australian Open champion No. 8 Madison Keys, French Open victor No. 2 Coco Gauff, and newly crowned Wimbledon champ No. 3 Iga Świątek.

Joining Gauff in punching her ticket to Saturday's Round of 16 is fellow US player No. 32 McCartney Kessler, while Keys and several others in the US contingent — No. 4 Jessica Pegula, No. 7 Amanda Anisimova, and No. 116 Caty McNally — will battle to advance from the Round of 32 on Friday.

Other fan favorites are also still in the mix, including Japan's No. 49 Naomi Osaka and the UK's No. 33 Emma Raducanu, while 18-year-old phenom No. 85 Victoria Mboko is impressing as Canada's last-standing contender in play.

Notably sitting out this week is world No. 1 Aryna Sabalenka, with the 2024 US Open champ prioritizing her mental and physical rest ahead of her title defense.

How to watch the 2025 Canadian Open

The 2025 Canadian Open's Round of 32 continues throughout Friday before the Round of 16 takes the Montréal court on Saturday.

Continuous live coverage of the tournament will are on the Tennis Channel.